JP2003203721A - Direct current power outlet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a direct current power outlet of a small size having a good arc extinguishing effect as improvement of the conventional technique involving such a problem as arc generation when a plug is to be inserted or drawn out in the condition that the supply voltage becomes high to result in a degradation of the contacts of the outlet, one of the countermeasures thereto being mounting any arc extinguishing material in the plug which should however require enlargement of the plug size. <P>SOLUTION: A third contact 16 is provided in a position which is located nearer the innermost than a first contact 14 connected with the positive electrode side in direct current power supply of the outlet 1 and where the first terminal 21 of the plug touches, while a second contact 15 of the outlet is connected with the negative electrode side of the DC power supply through a MOSFET 11, and the potential due to a divided voltage resistance connected between the third contact 16 and the negative electrode side potential is impressed on a gate electrode so that the MOSFET is controlled. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a DC outlet in a DC distribution system.

[0002]

2. Description of the Related Art Conventionally, outlets are generally for AC power supplies, and are limited to DC power supplies of low voltage. For example, IEEJ Technical Report No. 818 "Technical Trends and Standardization of Power Supplies for Household Information Devices-Energy Saving Technologies in the IT Era, Power Supply Technology, Secondary Battery / Charger Technology"
As described on page 13, the voltage of the outlet connected to the DC low voltage system is 24V or less. In this case, since the target is a home information device, the power supply is comparatively small, and there was no problem when plugging / unplugging. However, when the number of devices to which power is supplied increases, and particularly when a large amount of power is required at a relatively high voltage, sparks at the time of inserting / removing the power plug have been a problem. In this way, conventional outlets cannot be miniaturized because arc-extinguishing materials, etc. must be used in order to apply them to high-voltage DC power sources due to safety issues such as arcing when pulling out the plug. It was

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a small DC outlet having a function of ensuring safety without generating a spark even at a high voltage as described above. .

[0004]

In order to achieve the above object, according to the present invention, a first contact is provided inside an insertion opening on the side of a first terminal of a plug inserted into a DC power supply outlet. Is provided, and the first contact is connected to the positive electrode of the DC power supply. A second contact is provided inside the insertion port on the side of the second terminal of the plug, and the second contact is connected to the negative electrode of the DC power source via a semiconductor switch. In addition, a third contact is provided inside the insertion opening on the side where the first contact is provided, the third contact is located in the vicinity of the first contact, and the first terminal of the plug has the first contact. It is in a position where it comes into contact after making contact with the contact, and is insulated from the first and second contacts. The third contact is connected to a terminal that controls the disconnection / connection of the semiconductor switch.

Further, as a concrete structure of the semiconductor switch portion, the second contact is connected to the drain electrode of the MOSFET, and the source electrode of the MOSFET is connected to the negative electrode of the DC power source. The first and second resistors are connected in series with the negative side of the power source,
One end of the first resistor is connected to the third contact, one end of the second resistor is connected to the negative electrode side of the DC power supply, that is, the source electrode of the MOSFET, and the connection point of the first and second resistors is MOS.
It is connected to the gate electrode of the FET. In addition,
The third contact is installed at a position deeper than the first contact provided in the insertion opening for the first terminal of the plug and capable of contacting the first terminal of the plug.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of a DC outlet according to the present invention. The outlet 1 includes a MOSFET 11 which is a semiconductor switch, resistors 12 and 13 for voltage division for applying a bias voltage to the MOSFET 11, and contacts 14, 15 and 1 on the receiving side of the plug 2.
Have six. The plug 2 also has terminals 21 and 22 that are on the insertion side into the outlet. The contact 14 provided in the insertion port 31 of the outlet 1 which is the receiving side of the terminal 21 in the plug 2 is connected to the power supply terminal 5 which is the positive side of the DC power supply, and is the receiving side of the terminal 22 in the plug 2. The contact 15 provided in the insertion port 32 of the outlet 1 is connected to the drain electrode 111 of the MOSFET 11, and the source 112 of the MOSFET 11 is connected to the power supply terminal 6 on the negative side of the DC power supply. Resistor 12 is MO
The SFET 11 is connected between the source terminal 112 and the gate terminal 113, and the resistor 13 is connected between the gate terminal 113 and the contact 16 of the MOSFET 11. Contact 16
Is for the insertion opening 31 for the terminal 21 in the plug 2,
It is at a position farther back than the contact point 14, contacts the plug 21 when the plug 2 is fully inserted, and
And other parts are provided so as not to have electrical continuity.

When the plug 2 is inserted into the outlet 1, first, the terminals 21 and 22 are respectively connected to the contact 14 connected to the positive power supply terminal 5 in the outlet 1 and the contact 15 connected to the drain terminal 111 of the MOSFET 11. Then, the plug 2 is further inserted, and then the terminal 21 contacts the contact 16. Since the terminal 21 is already at the positive potential of the DC power supply, the resistors 12 and 13 are used to connect the MOSFE
The divided voltage is applied to the gate terminal 113 of T11, the MOSFET 11 is turned on, and the power supply terminal 6 on the negative electrode side and the terminal 22 are connected. As described above, electric power can be supplied from the outlet 1 to the plug 2. Here, the contact 16 may be a spring type switch or the like.

When the plug 2 is pulled out from the outlet 1, the contact 16 is first separated so that the MOSFE
The bias voltage of T11 becomes 0 V, the MOSFET 11 is cut off, the circuit is opened, and then the contact between the terminals 21 and 22 of the plug 2 is cut off. As described above, even if power is being supplied, the plug 2 can be pulled out without generating an arc because the electronically disconnected state is established before the mechanically disconnected state.

[0009]

As described above, according to the DC outlet of the present invention, when the plug is pulled out from the outlet, the semiconductor switch such as MOSFET provided in the outlet is turned off immediately before the contact of the terminal of the plug is cut off. Since it has the means, it is possible to use the DC power supply while maintaining a safe state even for a load device or the like that uses an existing rectifier circuit for AC 100V. Moreover, since an additional part such as a part for extinguishing an arc is unnecessary, the outlet can be made small.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a DC outlet according to the present invention.

[Explanation of symbols]

1: outlet 11: MOSFET 12: First resistance 13: Second resistance 14: First contact 15: Second contact 16: Third contact 111: MOSFET drain electrode 112: MOSFET source electrode 113: MOSFET gate electrode 2: Plug 21: First terminal 22: Second terminal 31, 32: insertion port 5: DC power source positive electrode 6: DC power supply negative electrode

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Satoshi Otsu             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation (72) Inventor Mikio Yamazaki             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation (72) Inventor Nobuhiko Yamashita             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation (72) Inventor Kunitoshi Tazume             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation (72) Inventor Yasushi Hiraoka             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation F-term (reference) 5E021 FA03 FA16 FC03 FC38 MA19                       MB01 MB12

Claims (2)

[Claims] 1. A DC power supply outlet having two insertion openings for a positive electrode and a negative electrode.
A first contact is provided inside the insertion opening for the terminal of the plug, the first contact is connected to the positive electrode of the DC power supply, and the second contact is provided inside the insertion opening for the second terminal of the plug. Is provided, the second contact is connected to a negative electrode of a DC power source via a semiconductor switch, and the first terminal of the plug is in contact with the first contact in the vicinity of the first contact. After contacting, the first position
And a third contact which is insulated from the second contact, the third contact being connected to a terminal for controlling breaking / connection of the semiconductor switch. 2. The DC outlet according to claim 1,
The second contact in the insertion opening for the second terminal of the plug is connected to the drain electrode of the MOSFET,
The source electrode of the OSFET is connected to the negative electrode of the DC power supply,
Both ends of the first resistor are connected to the source electrode and the gate electrode of the MOSFET, respectively, and both ends of the second resistor are connected to the gate electrode of the MOSFET and the third contact, respectively, and the third contact is the plug. The DC outlet, which is provided at a position deeper than the first contact provided in the insertion port for the first terminal in and contacting the first terminal of the plug.