JPH09148012A - Ac adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a domestic/overseas applicable type AC adapter having high safety while requiring no plug adapter. SOLUTION: The insertion plug 5 of an AC adapter 1 is pivoted freely in longitudinal turning motion for which 2 systems of plugs consisting of 220V plug 6 and 100V plug 7 are formed integrally with each other. Spring contacts 11, 12, 13, 14 respectively corresponding to movable contact parts 6a, 7a of respective plugs 6, 7 are arranged on a power supply circuit board 4. In such a state as forcing 100V plug 7 to stand up, 100V movable contact part 7a touches spring contacts 12, 13. When a 220V plug 6 is made to stand up, its movable contact 6a is connected to spring contact 11, 14. Spring contacts 11, 14 and 12, 13 are connected to the primary winding of a power transformer TR and winding rations of 11, 14 to 12, 13 are set to 2.2:1 and owing to falling turn operation of the insertion plug 5, adaptation to two kinds of plug socket is made possible and also setting of input voltage may be automatically switched.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC adapter, and more particularly to an AC adapter adapted to be compatible with commercial power supply voltages of various countries in the world.

[0002]

2. Description of the Related Art For example, AC100V to AC240V
AC adapter with a built-in output voltage control circuit that obtains a constant DC output with respect to the input voltage of
C adapters are widely used. Also, these AC
Storage battery chargers integrated with adapters are also popular.

This type of AC adapter is constructed so that it can be used regardless of the commercial power supply voltage of each country in the world. However, since the shape of the outlet of the power supply differs depending on the country, the plug of the AC adapter is different. If it does not fit into the outlet, it is necessary to use a plug adapter that changes the plug shape.

[0004]

An AC adapter having an output voltage control circuit built therein has a disadvantage that it is more expensive than an AC adapter having an input voltage changeover switch because of its complicated structure. In addition, in the input voltage changeover type AC adapter, there is a drawback that the transformer may be burnt or the connected electrical equipment may be damaged due to an erroneous operation of the changeover switch.

In addition, in any type of AC adapter, a plug adapter is required if the insertion plug does not conform to the shape of the outlet when used, but carrying a separate plug adapter is troublesome. Yes, you may lose the removed plug adapter.

[0006] Therefore, while suppressing the manufacturing cost, eliminating the risk of erroneous operation to improve the safety,
The technical problem to be solved arises in order to provide an AC adapter that does not require a plug adapter and is easy to handle and handle. The present invention aims to solve the above problems.

[0007]

DISCLOSURE OF THE INVENTION The present invention is proposed in order to achieve the above-mentioned object, and accommodates a power supply circuit such as a power transformer and a rectifier circuit in a housing and inserts the power supply circuit in the bottom surface of the housing. In an AC adapter provided with a plug, a hinge shaft or a bearing that serves as a rotation center is provided in an insulating plug body, and the shaft center of the hinge shaft or bearing is approximately 9
Rotation in which two-system plugs that are displaced by 0 degrees are integrally formed with the insulating plug body, and the two-system plugs are insulated from each other and penetrate the plug body, and the movable contact portion is exposed on the back side. Forming a insertion plug, and hinge-connecting the insertion plug to the housing so that the insertion plug can be turned upside down,
Two fixed contacts corresponding to the movable contact portions of the two plugs are provided in the housing, and the insertion plug is rotated to raise any one plug so that the plug is raised. The movable contact portion of the plug and the circuit contact corresponding to the movable contact portion are formed so as to be in contact with each other, and the fixed contacts are respectively connected to the primary windings of the power transformer, and the primary winding ratio of each system. The present invention provides an AC adapter characterized in that a constant secondary voltage is obtained from a commercial power outlet suitable for each of the two system plugs.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the AC adapter 1,
A power supply circuit board 4 (circuit components not shown) having a power supply transformer TR mounted therein is housed in housings 2 and 3 which are divided into upper and lower parts. The plug-in plug 5 is attached.
The insertion plug 5 is pivotally attached to the front and rear so as to be rotatable back and forth, and is a European standard 220 / 240V standard plug 6 (hereinafter,
A 220V plug) and a 100 / 120V standard plug 7 (hereinafter referred to as 100V plug) are integrally molded. AC power supplied from an outlet of a commercial power supply via one of the plugs is stepped down by a power supply circuit, smoothed to DC, and output to a DC output cord (not shown).

FIG. 2 shows the insertion plug 5, in which a hinge shaft 9 is provided on the left and right side surfaces of a plug body 8 made of an insulating resin. The 220V plug 6 and the 100V plug 7 are mounted on the plug body 8 by molding while being displaced by 90 degrees in the radial direction with the hinge shaft 9 as the center of rotation.
The 20V plug 6 projects to the front of the plug body 8 and
The 0V plug 7 projects to the bottom surface, but each plug electrode plate is electrically insulated. In addition, each plug 6,
7 is a movable contact portion 6a at the rear end which penetrates the plug body 8;
7a is exposed, and the axis of the hinge shaft 9 and the movable contact portion 6 are
The distance between a and 7a is formed equal.

FIG. 3 shows the lower housing 3, and a hook for pivotally supporting the hinge shaft 9 of the insertion plug 5 in the vicinity of the left and right edges of the recess 3a which is the insertion plug housing chamber formed on the bottom surface. The section 10 is erected. The recess 3a has a shape that does not interfere with the insertion plug 5 so that the insertion plug 5 can be rotated back and forth. In FIG. 3 (a), a 220V plug 6 is fitted above the hook portion 10. A plug receiving groove 3b having a shape is formed, and a plug receiving groove 3c having a shape adapted to the 100V plug 7 is formed below.

When assembling the AC adapter 1, the plug body 8 of the plug 5 is inserted into the recess 3a of the lower housing 3, and the left and right hinge shafts 9 are respectively hooked.
Is inserted into the hook portion 10 from the opening side thereof to be engaged. Then, the power circuit board 4 is placed in the lower housing 3,
The upper housing 2 is fitted into the lower housing 3 to form the AC adapter 1 shown in FIG.

As shown in FIG. 1A, the power supply circuit board 4
Includes four spring contacts 11 and 1 corresponding to the movable contact portions 6a and 7a of the 220V plug 6 and the 100V plug 7, respectively.
2, 13 and 14 are arranged on the rotational axis of the insertion plug 5, and the hole 1 provided in the recess 3 a of the lower housing 3
It projects through the recess 5 into the recess 3a.

As shown in FIG. 1B, the spring contacts 11,
Reference numerals 12, 13, and 14 individually correspond to the movable contact portions 6a and 7a of the 220V plug 6 and the 100V plug 7, respectively, and the insertion plug 5 shown by a solid line in FIG. 100 with 100V plug 7 upright
A pair of movable contact portions 7a of the V plug 7 and spring contacts 12, 1
3 make contact.

Further, as shown by the chain line, if the insertion plug 5 is rotated forward to raise the 220V plug 6,
The movable contact portion 6a comes into contact with the spring contacts 11 and 14. Since the plugs 6 and 7 are insulated from each other,
When the AC adapter 1 is used, even if it comes into contact with the plugs on the side housed in the plug housing grooves 3b and 3c, there is no risk of electric shock.

FIG. 4 is a circuit diagram of the AC adapter 1. Spring contacts 11 and 14 of a 220V power source are connected to both ends of a primary winding of a power transformer TR, an intermediate tap is drawn from the primary winding, and a 100V power source is placed here. Is connected to the spring contact 12, and the spring contact 13 is connected to one end of the primary winding.

Spring contacts 11, 14 and spring contacts 12, 13
The primary winding ratio is 2.2: 1, which is a constant secondary voltage for both the 220V current input through the 220V plug 6 and the 100V current input through the 100V plug 7. Is obtained. Therefore, insert plug 5
There is no risk of erroneous operation because the setting of the input voltage is automatically switched in association with the selection of the plug, while it can be adapted to two types of outlets by turning the plug back and forth.

In the above embodiment, the combination of the 220V plug 6 and the 100V plug 7 is exemplified, but it is possible to combine the plugs of various standards by appropriately setting the primary winding ratio. It goes without saying that it covers modifications.

[0018]

As described above, according to the AC adapter of the present invention, the insertion plug provided with two types of plugs can be turned upside down and the plug that fits the outlet can be raised. Since the input voltage of the transformer is automatically switched by the switch function of its own, there is no need for a primary winding changeover switch or an expensive voltage control circuit, and there is no need for a plug adapter. And it can handle outlets. Therefore, it is possible to eliminate the risk of failure due to erroneous operation of the changeover switch, improve safety, and provide an AC adapter that is easy to handle, low in cost, and excellent in portability.

[Brief description of the drawings]

FIG. 1 shows an AC adapter of the present invention, (a) is a side sectional view, and (b) is a bottom view.

2 shows the insertion plug of FIG. 1, (a) is a front view, (b) is a bottom view, (c) is a rear view, (d) is a side view, and (e) is a plan view. .

3 is a bottom view of FIG. 1, (a) is a bottom view, (b) is a front view, and (c) is a side sectional view.

FIG. 4 is a circuit diagram of the AC adapter of FIG.

[Explanation of symbols]

 1 AC Adapter 3 Lower Housing 4 Power Circuit Board 5 Insertion Plug 6 220V Plug 7 100V Plug 8 Plug Body 9 Hinge Shaft 10 Hook Part 11, 12, 13, 14 Spring Contact TR Power Transformer

Claims (1)

[Claims] 1. An AC adapter in which a power supply circuit such as a power transformer and a rectifying circuit is housed in a housing, and a plug is provided on the bottom surface of the housing, in which a hinge shaft or a bearing serving as a rotation center is provided in an insulating plug body. Is provided
A two-system plug that is displaced by about 90 degrees about its axis is integrally molded with the insulative plug body, and the two-system plugs are insulated from each other and penetrate the plug body. A rotary type insertion plug with an exposed movable contact part is formed on the housing, and the insertion plug is hinged to the housing so that the insertion plug can be turned upside down. The housing corresponds to the movable contact parts of the two systems of plugs. 2 fixed contacts are provided, and by rotating the insertion plug to raise any one of the plugs, the movable contact portion of the raised plug and the circuit contact corresponding to the movable contact portion. And the fixed contacts are respectively connected to the primary windings of the power transformers, and the primary winding ratios of the respective systems are made different to suit the respective plugs of the two systems. AC adapter, wherein the formed that as from a commercial power outlet is obtained a constant secondary voltage.