JP2002324637A - Conversion adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adapter that enables to connect a power supply plug of DC electric apparatus into the existing receptacle and prevents a reversed polarity voltage from being applied. SOLUTION: The housing 11 of a conversion adapter 10 is equipped with a pair of plug terminals 12 that are connected to the DC power supply line of a receptacle 30 and a pair of receiving terminals 15A, 15B. The plug terminals 12 can be connected to the existing receptacle 30 and can be inserted in reversal. An L shape slit 13 is formed in the housing 11 and a plug terminal 23 having a cross section of L-shape can be inserted in only prescribed direction. A rectification circuit 14 of bridge type is housed in the housing 11 and its input side is connected to a pair of plug terminals 12 and the output side is connected to a pair of receiving terminals 15A, 15B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a conversion adapter for connecting a power plug of a DC electric device.

[0002]

2. Description of the Related Art In some electric devices, it is preferable to supply electric power by direct current. In order to supply power to such a DC electric device installed indoors, for example, an outlet is provided on the wall of the room, a DC power line is connected to this outlet, and a power plug of the DC electric device is connected to this outlet. Configuration. In the case of such a DC electric device, it is necessary to connect the power plug to the outlet in the opposite direction to prevent the application of a voltage of the opposite polarity. On the contrary, the plug terminal has a vertically asymmetric shape so that it cannot be inverted and connected to the outlet.

[0003]

However, since a dedicated outlet corresponding to the above-described power plug for DC electric equipment cannot be installed, an existing AC outlet is used, and a DC power line is connected to the existing AC outlet. Sometimes you have to connect. In this case, since the existing outlet and the shape of the power plug of the DC electric device cannot be inserted due to the difference, a conversion adapter that enables the power plug of the DC electric device to be connected to the existing outlet is required. . This configuration has a plug terminal that can be inserted into an existing outlet and a receiving terminal that can be inserted with a power plug of a DC electric device.

However, when the above-mentioned conversion adapter is used, the power plug of the DC electric device can be connected to the existing outlet because of its structure, but the plug terminal of the conversion adapter is inverted with respect to the existing AC outlet. Insertion, the possibility of inputting a voltage of the opposite polarity to the DC electric device occurs. The present invention has been made in view of the above circumstances, and it is possible to connect a power plug of a DC electric device to an existing outlet, and to surely apply a voltage of opposite polarity to the DC electric device. It is an object of the present invention to provide a conversion adapter that can prevent such a problem.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a conversion adapter for connecting a power plug of a DC electric device to an outlet provided to be connected to a DC power supply line. A pair of plug terminals connected in a reversible manner, a pair of receiving terminals to which a power plug of a DC electric device is connected in a non-reversible manner, and an input side connected to the pair of plug terminals and an output side connected to the pair of plug terminals. The present invention is characterized in that it comprises a bridge-type rectifier circuit connected to a pair of receiving terminals.

[0006]

In order to supply power to the DC electric equipment from the existing AC outlet connected to the DC power supply line, the plug terminal of the conversion adapter is connected to the outlet, and the power plug of the DC electric equipment is connected. Connect the plug terminal to the receiving terminal of the conversion adapter. According to the present invention, a bridge-type rectifier circuit is provided between the plug terminal and the receiving terminal, and the connection polarity between the power plug and the receiving terminal of the conversion adapter cannot be reversed. The rectifier circuit always has the same polarity on the output side even if the polarity on the input side is reversed. Applied.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. The conversion adapter 10 of the present embodiment is used for connecting a power plug 20 of a DC electric device (not shown) driven by DC power to an outlet 30 attached to a room wall 40.

The power plug 20 is constructed by projecting a pair of conductive metal plug terminals 23 into, for example, a plastic plug housing 22 provided at the end of a power cord 21. Each of the plug terminals 23 has a protruding piece shape having an L-shaped cross section, and is fixed to the plug housing 22 with the long side portions 23A facing each other and the short piece portions 23B extending in opposite directions.

On the other hand, the outlet 30 is connected to the panel unit 3.
1 is formed with two pairs of I-shaped slits 32,
A pair of receiving terminals 3 corresponding to each slit 32 inside 1
3A and 33B are fixed, and have the same structure as a commonly used AC outlet. In this embodiment, the positive and negative power lines 34A and 34B of the DC power line are connected to the two receiving terminals 33A and 33B.

The conversion adapter 10 has the following configuration. Box-shaped plastic housing 1
A pair of plug terminals 12 protrude from one side surface,
On the opposite side, the plug terminal 2 of the power plug 20 is provided.
3 are formed with a pair of L-shaped slits 13. Each of the plug terminals 12 has a protruding piece shape having an I-shaped cross section, is fixed to the housing 11 in a state of facing each other, and can be inserted into the I-shaped slit 32 of the outlet 30. Since the plug terminal 12 has an I-shaped cross section and the same shape, the plug terminal 12 can be inserted upside down into the outlet 30.

Each L-shaped slit 13 has a long side 1
3A are in a parallel state, the short sides 13B extend in opposite directions, and the plug terminals 23 of the power plug 20 can be inserted only in the direction corresponding to the L-shaped slit 13. In the housing 11, a pair of receiving terminals 15A and 15B are fixed corresponding to the respective L-shaped slits 13 (see FIG. 2). When the plug terminals 23 are inserted into the L-shaped slits 13, the respective plug terminals 23 are formed. Is receiving terminal 15
A, 15B. As shown in FIG. 2, a rectifier circuit 14 formed by connecting four diodes in a bridge type is provided in the housing 11, and a pair of DC input side lines are connected to the plug terminals 12. The pair of output lines are connected to the receiving terminals 15A and 15B.

Next, the operation of the present embodiment will be described. Now, it is assumed that positive and negative power lines 34A, 34B of DC power lines are connected to the receptacle terminals 33A, 33B of the outlet 30 attached to the room wall 40.
In this state, the power plug 2
To supply DC power through zero, do the following:
First, the plug terminal 23 of the power plug 20 is inserted into the L-shaped slit 13 of the conversion adapter 10 so that the conversion adapter 10 is attached to the tip of the power plug 20. After this,
The conversion adapter 10 is attached to the outlet 30 by inserting the plug terminal 12 of the conversion adapter 10 into the I-shaped slit 32 of the outlet 30. Outlet 3 of conversion adapter 10
To the plug terminal 12 of the conversion adapter 10.
Is an I-shape, and can be in any of the vertical directions. Here, assuming that the conversion adapter 10 is connected, for example, in the direction shown in FIG.
A current flows in a normal direction to the DC electric device L as a load.

On the other hand, if the conversion adapter 10 is attached to the outlet 30 in the opposite direction as shown in FIG. 1B, the current from the DC power supply line 34A will now pass through the rectifier circuit 14 through the rectifier circuit 14 in FIG. Unlike FIG. 2A, the current flows in the direction shown in FIG. 2B, but the receiving terminals 15A and 15B have the same polarity as in FIG.
, A current flows in the normal direction as in (A).

As described above, according to the present embodiment, the rectifier circuit 14 incorporated in the conversion adapter 10 can always keep the polarity on the output side constant even if the polarity on the input side is inverted. No matter which direction you connect to
A voltage of the same polarity can always be applied to a DC electric device. As a result, the power plug 2
0 can be connected not only to an outlet 30 having an I-shaped slit 32 having a shape different from that of the plug terminal 12, but also to the outlet 30 as in the case of the AC outlet even if the outlet 30 is connected to a DC power supply line. Can be used without worrying about the mounting direction of the conversion adapter 10 with respect to.

<Other Embodiments> The present invention is not limited to the embodiments described above with reference to the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition, various changes can be made without departing from the scope of the invention.

(1) In the above embodiment, the outlet 30
Is shown attached to the chamber wall 40, but the present invention is not limited to this. For example, as shown in FIG. 4, a plug 50 having an I-type plug terminal 12 for inserting a conversion adapter into an outlet 30 and an L-type A plug terminal 12 of the plug 50 is connected to the table tap portion 51 via an electric wire 52, and the conversion adapter 10 is connected to the table tap portion 51.
A rectifier circuit 14 and receiving terminals 15A and 15B similar to those described above may be incorporated.

(2) In the above embodiment, the power plug 20
The plug terminal 23 has an L-shaped cross section.
It may have a shape other than the L-shape, and if necessary, any configuration may be used as long as the power supply plug 23 is connected to the adapter 10 so that the connection polarity cannot be inverted.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a circuit configuration inside a conversion adapter.

FIG. 3 is a circuit diagram showing a connection relationship between a conversion adapter, a DC power line, and a power plug.

FIG. 4 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Conversion adapter 12 ... Plug terminal 13 ... L-shaped slit 14 ... Rectifier circuit 20 ... Power plug 23 ... Plug terminal 30 ... Outlet 32 ... I-shaped slit 34A, 34B ... DC power supply line

Claims (1)

[Claims] 1. A conversion adapter for connecting a power plug of a DC electric device to an outlet connected to a DC power line, wherein the conversion adapter is connected to the outlet so that the polarity of the connection to the DC power line can be inverted. A pair of plug terminals, a pair of receiving terminals to which a power plug of the DC electric device is connected so that connection polarity cannot be reversed, and an input side is connected to the pair of plug terminals and an output side is the pair of receiving terminals. And a bridge-type rectifier circuit connected to the converter.