JPH04255296A - Power supply adapter - Google Patents

Abstract

PURPOSE:To enable a power supply adapter to be lessened in number of component parts and simplified in assembly operation by a method wherein a case shell or a metal plate or a metal foil is provided outside to cover a power supply circuit. CONSTITUTION:An upper case member 2 and a lower case member 3 are assembled into a box of rectangular parallelepiped as a whole. Metal plates 5 and 6 are buried in the shells of the upper and the lower case member, 2 and 3, respectively. The case members 2 and 3 can be formed of plastics, the metal plates 5 and 6 of iron or the like can be used, and the metal plates 5 and 6 can be buried in the case members 2 and 3 through an integral molding method. As a power supply adapter 1 is composed of the case members 2 and 3 where the metal plates 5 and 5 are buried, a power supply circuit is not required to be housed in a plastic case after it is covered with a metal cover, and as a result a power supply adapter can be lessened in number of component parts and easily assembled.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply adapter in which a power supply circuit such as a switching power supply is disposed within a case.

0002

2. Description of the Related Art Conventionally, a common method for electromagnetically shielding a power supply circuit is to cover the power supply with a metal cover (shield plate). The same applies to power adapters in which a power supply circuit is placed inside a plastic case; the power supply circuit is covered with a metal cover and placed inside the plastic case to provide electromagnetic shielding.

0003

[Problems to be Solved by the Invention] In the above-mentioned prior art, the device must be placed in a plastic case with a metal cover over it, which takes time and effort to assemble.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional example, it is an object of the present invention to provide a power adapter that reduces the number of parts and is easy to assemble.

[0005]

[Means for Solving the Problems] The power supply adapter according to the present invention is characterized in that it includes a metal plate or metal foil embedded in a shell of a case that covers a power supply circuit.

[0006] This metal plate or metal foil is preferably connected to the ground wire of the power supply circuit section. Further, the case may be constructed by combining a plurality of case members. In this case, metal plates or metal foils are embedded in at least two or more case members, and these metal plates or metal foils are exposed at the ends of the case members so that they contact each other when the case members are combined. good.

Furthermore, the power adapter according to the present invention includes:
The present invention is characterized in that a metal plate or metal foil is attached to the outside of the case that covers the power supply circuit section, and the metal plate or metal foil is connected to the ground wire of the power supply circuit section.

[0008]

[Operation] The metal plate or metal foil embedded in the shell of the case acts as a shield plate. This metal plate or metal foil is embedded in the shell of the case, reducing the number of parts.
It becomes easy to assemble.

When constructing a case by combining a plurality of case members, metal plates or metal foils are embedded in the case members, and the case members are arranged so that these metal plates or metal foils come into contact with each other when the case members are combined. If the ends are exposed, a greater electromagnetic shielding effect can be obtained.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross section of a power adapter 1 according to an embodiment of the present invention. Figure 2 shows the power adapter 1 in Figure 1.
A cross section taken along the plane XX' perpendicular to the cross section of is shown. Figure 1
In FIG. 2, 2 is an upper case member, 3 is a lower case member, and these upper and lower case members 2, 3
are combined to form a rectangular box-shaped case as a whole. A power circuit board 4 is arranged inside the case, and electronic components such as a transformer 40 and a capacitor 42 are arranged on this board 4. Note that the substrate 4 is omitted in FIG. 2. The shell portion of the upper case member 2 (in the embodiment, the top wall portion 2a
) is embedded with a metal plate 5. Lower case member 6
A similar metal plate 6 is also embedded in the bottom wall portion 3a (in the embodiment). The metal plates 5 and 6 can be connected to the ground wire of the power supply circuit. Upper case 2 and lower case 3
can be made of plastic, for example, and the metal plates 5, 6 may be made of iron or the like, and can be embedded in the cases 2, 3 by integrally molding the metal plates 5, 6.

The power supply adapter 1 shown in FIGS. 1 and 2 has shielding metal plates 5 and 6 embedded in the shell of its case, so the power supply circuit is covered with a metal cover and placed inside the plastic case as in the conventional case. There is no need to place it in That is, the number of parts is reduced and assembly work becomes easier.

FIG. 3 shows a cross section of a power adapter in which the metal plates 5 and 6 of FIGS. 1 and 2 are embedded so as to be exposed from the end of the case member. In FIG. 3A, the power adapter 11 has an upper case member 12 and a lower case member 13. A metal plate 15 is embedded in the shell portion (top wall portion 12a, both end wall portions 12b, 12c) of the upper case member 12. Lower case member 16 (bottom wall portion 13a,
Similar metal plates 16 are embedded in both end wall portions 13b, 13c). The metal plates 15 and 16 can be connected to the ground wire of the power supply circuit. The metal plate 15 is exposed to the outside at the end of the case member 12. The metal plate 16 is the case member 1
The end of 3 is exposed to the outside.

FIG. 3(b) is an enlarged view of a portion 17 of the power adapter 11 shown in FIG. 3(a), which is a combination of the case member 12 and the case member 13. Reference numeral 18 indicates an exposed portion of the metal plate 15, and 19 indicates an exposed portion of the metal plate 16. Case member 1
In the case member 13, the outer part of the end part protrudes below the inner part, and the end part of the metal plate 15 is exposed on the inner surface of this protruding part, and in the case member 13, contrary to the above,
The inner part of the end protrudes higher than the outer part,
The end of the metal plate 16 is exposed on the outer surface of this protrusion. By bringing case member 12 and case member 13 together, exposed portion 18 and exposed portion 19 are brought into contact at portion 17 . In particular, the exposed portion 19 has spring properties to ensure contact with the exposed portion 18.

According to the power supply adapter 11 shown in FIG. 3, substantially the entire power supply circuit can be covered with the metal plates 15 and 16, so that the shielding becomes more complete.

FIG. 4(a) shows the appearance of a power adapter with metal foil pasted on the outside of the case covering the power circuit section. This power adapter 21 has a plastic case 22 and a metal foil 23 attached to the outside of the plastic case 22. A power supply circuit is arranged inside the plastic case 22, as shown in FIG. For example, aluminum foil, iron foil, etc. may be used. The metal foil 23 is attached to the outside of the plastic case 22 using an adhesive or adhesive, and is further fixed with screws 26. The metal foil 23 may be printed with the rated values and notes of the power adapter, and the metal foil 23 may also be used as a rating label or a caution label. 24 is 3P which becomes the input terminal of the power adapter 21
Inlet 25 is a power output line.

FIG. 4(b) shows a cross section of the main part of the power adapter 21 of FIG. 4(a), and FIG. 5 shows a Y'
A cross-sectional view is shown. The metal foil 23 affixed to the outside of the case is fixed by screws 26 and 27, and one end of the connection wires 28 and 29 are connected to the screws 26 and 27, and the other end of the connection wires 28 and 29 is connected to the 3P inlet 24. It is connected to the ground terminal 30 of. Note that the upper case 22a and lower case 22b of the case 22 are attached by connecting screws 44.

According to the power adapter 21 shown in FIG. 4, the metal foil 23 acts as a heat sink and also diffuses heat.

In each of the above embodiments, the metal plate may be replaced with a metal foil, and the metal foil may be replaced with a metal plate. The metal used for the metal plate or metal foil may be any metal as long as it has an electromagnetic shielding effect. For example, aluminum, iron, copper, etc. are used.

[0020]

[Effects of the Invention] As explained above, according to the present invention,
Since a metal plate or metal foil is provided on the shell or outside of the case that covers the power supply circuit, the number of parts is reduced and assembly work is simplified. Furthermore, it is possible to prevent leakage of electromagnetic radiation and noise from switching power supplies and the like.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a power adapter according to an embodiment of the present invention;

[Figure 2] Plane X- perpendicular to the cross section of the power adapter in Figure 1
Cross-sectional view at X′,

[Fig. 3] A cross-sectional view of a power adapter with a metal plate embedded so as to be exposed from the end of the case member.

[Figure 4] External view and sectional view of main parts of a power adapter with metal foil pasted on the outside of the case,

FIG. 5 is a sectional view taken along line YY' of the power adapter of FIG. 4;

[Explanation of symbols]

1, 11, 21 Power adapter 5, 6, 15,
16 Metal plate 12 Upper case member 13 Lower case members 18, 19 Exposed portion of metal plate 22 Plastic case 23 Metal foil 24 3P inlet 25 Power output line 26, 27 Screws 28, 29 Connection line 30 Earth terminal.

Claims (4)

[Claims] 1. A power adapter comprising a metal plate or metal foil embedded in a shell of a case that covers a power circuit. 2. The power adapter according to claim 1, wherein the metal plate or metal foil is connected to a ground wire of the power supply circuit section. 3. The case is constructed by combining a plurality of case members, and a metal plate or metal foil is embedded in at least two or more case members, and the metal plate or metal foil covers the case member. Claim 1: The case members are exposed at their ends so as to come into contact with each other when assembled.
Power adapter listed in. 4. A power adapter characterized in that a metal plate or metal foil is attached to the outside of a case that covers a power supply circuit section, and the metal plate or metal foil is connected to a ground wire of the power supply circuit section.