JP2000023376A - Charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently radiate heat in various usage states, and to smoothly discharge the liquid that enters a case or leaks from a cell. SOLUTION: A charger incorporates a power transformer 3 and a printed- circuit board 4 into a case 2 with a fitting part 1 of a secondary cell. The power transformer 3 and the printed-circuit board 4 are incorporated at a side of the case opposite to each other. In the case 2, the fitting part 1 is provided on the upper surface of a part where the printed-circuit board 4 is incorporated, and a projection part 5 is provided at the bottom part of one end part, where the power transformer 3 is incorporated. In the projection part 5, an input connector 6 for connecting a power cord is made to be incorporated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charger for charging a secondary battery, and more particularly to a charger for inputting commercial power through a power cord.

[0002]

2. Description of the Related Art A conventional plug-in type charger has a mounting portion for detachably mounting a secondary battery on an upper surface of a case, and has a power transformer and a printed circuit board built therein. . The printed circuit board fixes an electronic component that implements a charging circuit that converts a secondary output of the power transformer into a charging voltage of the secondary battery. Further, the power plug is fixed by projecting from the bottom of the right part of the case. The power plug is connected to the primary side of the power transformer.

[0003]

SUMMARY OF THE INVENTION
Connect the power plug to the outlet and charge the secondary battery set in the mounting part. When charging by inserting the power plug into the outlet fixed to the vertical wall, the bottom of the case approaches the wall. For this reason, there is a disadvantage that heat radiation from the bottom surface of the case is deteriorated and heat cannot be efficiently dissipated. In particular, if the power plug is inserted into an outlet so that the power transformer is located at the bottom, the heat of the power transformer will not be efficiently dissipated, and the printed circuit board and the secondary battery may be heated, causing adverse effects due to the heat. is there. Further, even when the power plug of the charger is inserted into an outlet fixed to the floor, the case is close to the floor and heat radiation is deteriorated.

Furthermore, when the power plug is used by inserting the power plug into an outlet so that the case is horizontal, the battery leaks into the case through an opening provided in the mounting portion.
Furthermore, the leaked liquid cannot be smoothly discharged out of the case. For this reason, there is also a problem that the leakage of the battery deteriorates the insulation of the printed circuit board and the power transformer, or corrodes them to cause a failure.

The present invention has been developed with the object of solving such disadvantages. An important object of the present invention is to enable efficient heat dissipation even when used in various conditions.
It is an object of the present invention to provide a charger that can smoothly discharge liquid from a battery in a case.

[0006]

The battery charger of the present invention has the following arrangement to achieve the above object. The charger includes a case 2 having a mounting portion 1 on an upper surface for detachably mounting a secondary battery, a power transformer 3 built in the case 2, and a secondary output of the power transformer 3. And a printed circuit board 4 incorporated in the case 2 and fixing an electronic component for realizing a charging circuit for converting the charging voltage into the charging voltage.

Further, in the battery charger of the present invention, the power transformer 3 and the printed circuit board 4 are built in the opposite sides of the case 2 from each other. The case 2 has the mounting portion 1 provided on the upper surface of a portion in which the printed circuit board 4 is built. Further, a convex portion 5 is provided at the bottom of the end of the case in which the power transformer 3 is built, and the convex portion 5 has a built-in input connector 6 for connecting a power cord.

[0008] The battery charger according to claim 2 of the present invention is a case 2
Is composed of a plastic upper case 2A and a lower case 2B which are formed by being divided into upper and lower parts. Upper case 2A
A mounting portion 1 is provided on the upper surface of the lower case 2B, and a convex portion 5 for incorporating the input connector 6 is provided at an end of the lower case 2B.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a charger for embodying the technical idea of the present invention, and the present invention does not specify the charger as follows.

Further, in this specification, in order to make it easier to understand the claims, the numbers corresponding to the members described in the embodiments are referred to as "claims" and " In the column of “Means of the above”. However, the members described in the claims are not limited to the members of the embodiments.

The charger shown in the sectional view of FIG. 1, the side view of FIG. 2, the plan view of FIG. 3, and the front view of FIG.
A printed circuit board 4 and a power transformer 3 are built in. The power transformer 3 and the printed circuit board 4 are housed on opposite sides of the case 2 from each other. The case 2 shown in FIG. 1 includes a power transformer 3 on the right side and a printed circuit board 4 on the left side.

The case 2 incorporates a power transformer 3 and a printed circuit board 4 and is molded separately into an upper case 2A and a lower case 2B made of plastic so as to be easily assembled. The upper case 2A has a mounting portion 1 for mounting a battery formed on the upper surface on one side. The upper case 2 </ b> A has the opposite side of the mounting portion 1 formed in a shape that protrudes high to accommodate the power transformer 3. The case shown in the figure has a power transformer 3 built in with its right part formed high. Upper case 2A
The height of the power transformer 3 is higher than that of the printed circuit board 4 with the power transformer 3 and the printed circuit board 4 mounted on the lower case 2B on the same bottom surface.

The lower case 2B is formed such that substantially the entire bottom surface is formed into a flat shape, and a convex portion 5 is provided at the right end where the power transformer 3 is mounted so as to protrude from the lower surface. Convex part 5
Accordingly, the case 2 has a storage space 7 for housing the input connector 6. In other words, convex part 5
Is formed in a size that can accommodate the input connector 6 in the internal storage space 7. The input connector 6 is built in the storage space 7 of the projection 5 and is disposed below the power transformer 3. The lower case 2 </ b> B in which the input connector 6 can be built in the storage space 7 is arranged such that the power transformer 3 approaches the bottom surface of the lower case 2 </ b> B without being separated from the bottom surface of the lower case 2 </ b> B. A connector 6 can be provided.

The lower case 2B is provided with an opening window 8 for exposing the input connector 6 to the outside. The input connector 6
The lower case 2B is fitted to the opening window 8 and arranged at a fixed position. The input connector 6 is connected to the primary side of the power transformer 3 via a lead wire (not shown). Leads can also mechanically couple the input connector to the power transformer. In addition, the input connector can be fitted in the storage space of the case instead of the opening window and arranged at a fixed position. Further, the input connector can be adhered to the storage space and fixed at a fixed position of the lower case.

The convex portion 5 provided on the lower case 2B has a storage space 7 in which the input connector 6 is incorporated, and furthermore, the bottom surface of the case 2 is separated from the flat surface when the case 2 is placed on the flat surface. The bottom surface can be a heat dissipation surface.
Furthermore, with the case 2 placed on a flat table, the case 2 can be tilted so that water or battery leakage entering the case 2 can be smoothly discharged without flowing into the power transformer 3. In order to make the bottom surface of the case 2 a heat radiating surface, and to make the inflowing water or leaked liquid to the opposite side of the power transformer 3, it is preferable to make the convex portion 5 higher. However, there is a drawback in that the outer shape of the case 2 becomes larger when the convex portion 5 is made higher.
Therefore, the height of the protrusion 5 protruding from the bottom surface is 3 to 3
0 mm, preferably 5 to 20 mm, more preferably 5 mm
１５15 mm. The lower case 2 </ b> B has a bottom hole 11 on the bottom surface opposite to the convex portion 5 for discharging water or battery leakage.

The charger in which the input connector 6 is built in the storage space 7 of the projection 5 is a charger having a power plug as shown in FIGS. 5 to 9 by replacing only the lower case 2B. be able to. In the chargers shown in these figures, the power plug 13 is fixed to the lower case 2B. In this charger, the power plug 13 is inserted and fixed when the lower case 2B is formed, or the power plug 13 is fixed by bonding to the formed lower case 2B. To fix the power plug 13 in place. The power plug 13 is connected to the primary side of the power transformer 3 via a lead wire (not shown). As described above, only the lower case 2B is replaced and the power plug 1
The structure capable of manufacturing a charger including the input connector 6 and a charger including the input connector 6 has a feature that both types of chargers can be mass-produced inexpensively with few design changes.

The mounting portion 1 of the battery provided in the case 2 is formed in a groove shape having an open top, and the central portions of the side walls 15 on both sides are lowered so that the battery can be easily removed. In the case 2 shown in the drawing, a partition 16 is provided vertically in the center of the mounting portion 1 so that two cylindrical batteries can be mounted side by side on the mounting portion 1.

Openings 14 for exposing the charging contacts to the outside are provided at both ends of the mounting portion 1. The charging contact disposed in the opening 14 is electrically connected to a battery set in the mounting unit 1 to charge the battery. The charging contact is fixed to the printed circuit board 4 by soldering and connected to a charging circuit.

As shown in the sectional view of FIG. 1, the printed circuit board 4 is sandwiched between the upper case 2A and the lower case 2B, and is disposed at a fixed position of the case 2. In order to hold the printed circuit board 4, the lower case 2 </ b> B is integrally formed with a partition rib 9 that protrudes upward from the inner surface and mounts the printed circuit board 4.
The upper case 2A is integrally formed with a partition rib 10 for pressing the upper surface of the printed circuit board 4. The charger shown in FIG. 1 includes a partition rib 9 of a lower case 2B and a partition rib 1 of an upper case 2A.
At 0, the printed circuit board 4 is clamped and fixed at a fixed position.
The partition rib 10 is provided along the edge of the printed circuit board 4, and liquid or leaked liquid flowing from the opening 14 of the negative terminal, which is the left charging contact in FIG. 1, diffuses to the surface of the printed circuit board 4. To block.

The liquid that has entered through the opening 14 of the negative charging contact flows out through the bottom hole 11 provided on the bottom surface of the lower case 2B. The partition rib 9 integrally formed with the lower case 2B provides a drainage path 12 between the lower case 2B and the partition rib 9.
A bottom hole 11 is opened in the drainage passage 12. The partition rib 9 is
By contacting the lower surface of the printed circuit board 4, the liquid in the drainage channel 12 is prevented from diffusing to the lower surface of the printed circuit board 4.

On the upper surface of the printed circuit board 4, +-charging contacts are fixed. The charging contact on the right side shown in FIG. 1 is on the positive side, the entire shape is L-shaped, and the lower end is fixed to the printed circuit board 4. As shown in FIG. 1, the negative charging contact has an L-shape as a whole, and the upper end is folded back so that the battery can be pressed elastically.

The lower case 2B of this structure is
In the determined position, the input connector 6 and the power transformer 3
And the printed circuit board 4 and the upper case 2 is attached to the lower case 2B.
A is connected and assembled.

[0023]

The charger of the present invention can always efficiently radiate heat from the entire circumference even when used in various states. For this reason,
There is a feature that adverse effects due to heat of electronic components such as a semiconductor mounted on a printed circuit board and a charged secondary battery can be reduced. In particular, there is a feature that all users can safely charge the secondary battery without worrying about adverse effects due to heat. That is, the charger of the present invention has a power transformer and a printed circuit board built in on opposite sides of the case, and a mounting portion for a secondary battery is provided above the printed circuit board built-in portion of the case, and further a power transformer is built in the case. This is because a convex portion protruding from the bottom is provided at the end, and the convex portion prevents the bottom surface of the case from closely adhering to a wall surface or the like.

Further, in the battery charger of the present invention, the input connector is built in an internal storage space which can be formed as a protrusion provided to separate the bottom surface of the case from the wall surface or the like. For this reason, the input connector is built in by effectively utilizing the storage space formed by the convex portion provided to separate the case from the wall surface, so there is no need to provide a special space for incorporating the input connector, Another feature is that the space inside the case can be used very efficiently, making the whole compact. Furthermore, since a projection is provided below the power supply transformer and the input connector is provided here, the input connector is close to the power supply transformer and can be easily connected with a short lead wire.

Further, the charger of the present invention in which a convex portion is provided below the power transformer and the input connector is built therein is changed to a charger in which the lower case is replaced and the power plug is fixed. it can. Therefore, without changing other parts such as the printed circuit board, upper case, power plug, etc., only the lower case is changed, and two types of chargers, one with a built-in power plug and one with a built-in input connector Can be configured. Since a charger having this structure can use many parts in common, production efficiency can be improved and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a charger according to one embodiment of the present invention.

FIG. 2 is a side view of the charger shown in FIG. 1;

FIG. 3 is a plan view of the charger shown in FIG. 1;

FIG. 4 is a front view of the charger shown in FIG. 1;

FIG. 5 is a cross-sectional view of a charger in which a power plug is fixed to a case by changing the design of the charger of FIG. 1;

FIG. 6 is a side view of the charger shown in FIG. 5;

FIG. 7 is a plan view of the charger shown in FIG. 5;

FIG. 8 is a front view of the charger shown in FIG. 5;

FIG. 9 is a bottom view of the charger shown in FIG. 5;

[Explanation of symbols]

1. Mounting part 2. Case
2A ... upper case 2B ... lower case 3 ... power transformer 4 ... printed circuit board 5 ... convex part 6 ... input connector 7 ... storage space 8 ... opening window 9 ... partition rib 10 ... partition rib 11 ... bottom hole 12 ... drainage path 13 ... power plug 14 ... opening 15 ... side wall 16 ... partition

Claims (2)

[Claims] 1. A mounting section for detachably mounting a secondary battery.
A case (2) having (1) on the upper surface, a power transformer (3) built in the case (2), and a secondary output of the power transformer (3) converted to a charging voltage of a secondary battery. A power transformer (3) and a printed circuit board (4) are fixed to each other in a charger including an electronic component for realizing a charging circuit to be fixed and a printed circuit board (4) built in the case (2).
The case (2) has a mounting part (1) on the upper surface of the part containing the printed circuit board (4) and a power transformer (3). A charger having a convex portion (5) at the bottom of the end where the power connector is connected, and an input connector (6) for connecting a power cord to the convex portion (5). 2. A case (2) comprising an upper case (2A) and a lower case (2B) made of plastic which are divided into upper and lower parts. The upper case (2A) has a mounting portion (1) on the upper surface. Have, lower case
The charger according to claim 1, wherein (2B) has a convex portion (5) at an end.