JP3819300B2 - DC outlet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a DC outlet in a DC distribution system.
[0002]
[Prior art]
Conventionally, an outlet is generally for an AC power supply, and is limited to a low voltage for a DC power supply. For example, as described in IEEJ Technical Report No. 818, “Technology Trends and Standardization of Power Supplies for Home Information Equipment—Energy Saving Technology in the IT Age, Power Supply Method Technology, Secondary Battery / Charger Technology” on page 13. The voltage of the outlet connected to the low voltage system is 24V or less. In this case, since the target is a home information device, the power supply is relatively small, and there has been no problem in inserting and removing the plug. 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 during insertion / extraction of the power plug have been a problem. As described above, in the conventional outlet, it is necessary to use an arc extinguishing material or the like for application to a high voltage DC power supply due to safety problems such as an arc when pulling out the plug, and it cannot be reduced in size. It was.
[0003]
[Problems to be solved by the invention]
An object of the present invention is 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]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention,
A first contact is provided inside the insertion port on the side of the plug that is inserted into the outlet for supplying the DC power supply with respect to the first terminal, and this first contact is connected to the first pole of the DC power supply . ing. Further, a second contact is provided in the insertion port on the side of the plug with respect to the second terminal, the second contact is connected to the drain electrode of the MOSFET, and the source electrode of the MOSFET is connected to the DC power source. Connected to the second pole. Also, a third contact is provided inside the insertion opening on the side where the first contact is provided, and first and second resistors for applying a divided voltage of a DC power source to the gate electrode of the MOSFET , The third contact is located near the first contact and is in a position where the first terminal of the plug comes into contact with the first contact, and is insulated from the first and second contacts. . Further , 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 and the third contact of the MOSFET, respectively .
[0005]
Further, as a specific configuration of a semiconductor switch portion in front Symbol third contact first deeper than contact provided in the insertion mouth for the first terminal of the plug, and the first terminal of the plug It is installed at a position where it can come into contact.
[0006]
DETAILED DESCRIPTION OF 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 as a semiconductor switch, resistors 12 and 13 for voltage division for applying a bias voltage to the MOSFET 11, and contacts 14, 15, 16 serving as a receiving side of the plug 2. Further, the plug 2 has terminals 21 and 22 on the insertion side to the outlet. The contact 14 provided in the insertion port 31 of the outlet 1 serving as the receiving side of the terminal 21 in the plug 2 is connected to the power supply terminal 5 serving as the positive side of the DC power supply, and serves as 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. The resistor 12 is connected between the source terminal 112 and the gate terminal 113 of the MOSFET 11, and the resistor 13 is connected between the gate terminal 113 and the contact 16 of the MOSFET 11. The contact 16 is located at a position deeper than the contact 14 with respect to the insertion port 31 for the terminal 21 in the plug 2. When the plug 2 is sufficiently inserted, the contact 16 contacts the plug 21. These portions are provided so as not to have electrical continuity.
[0007]
When the plug 2 is inserted into the outlet 1, the terminals 21 and 22 first come into contact with 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, respectively. 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 divided voltage is applied to the gate terminal 113 of the MOSFET 11 by the resistors 12 and 13, the MOSFET 11 is turned on, and the power supply terminal 6 on the negative electrode side is connected. The terminal 22 is connected. As described above, 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.
[0008]
When the plug 2 is pulled out from the outlet 1, the bias voltage of the MOSFET 11 is first set to 0 V due to the separation of the contact 16, the MOSFET 11 is cut off, and the circuit is opened. As described above, even if power is being supplied, the plug 2 can be pulled out without generating an arc because it is electronically cut off before mechanically turning off.
[0009]
【The invention's effect】
As described above, according to the DC outlet of the present invention, when pulling out the plug from the outlet, it has means for shutting off a semiconductor switch such as a MOSFET provided in the outlet immediately before the terminal of the plug is disconnected, A DC power supply can be used while maintaining a safe state even for a load device or the like that uses an existing AC 100V rectifier circuit. Further, since an additional part such as an arc extinguishing part is not required, the outlet can be made small.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a DC outlet according to the present invention.
[Explanation of symbols]
1: Outlet 11: MOSFET
12: 1st resistor 13: 2nd resistor 14: 1st contact 15: 2nd contact 16: 3rd contact 111: MOSFET drain electrode 112: MOSFET source electrode 113: MOSFET gate electrode 2: Plug 21: 1st terminal 22: 2nd terminals 31, 32: Insert 5: DC power source positive electrode 6: DC power source negative electrode

Claims (2)

In the outlet for DC power supply having two insertion ports for the positive electrode and the negative electrode,
A first contact is provided inside the insertion opening for the first terminal of the plug,
The first contact is connected to a first pole of a DC power source;
A second contact is provided inside the insertion opening for the second terminal of the plug,
The second contact is connected to the drain electrode of the MOSFET, the source electrode of the MOSFET is connected to the second pole of the DC power supply;
The third contact is located in the vicinity of the first contact and in contact with the first terminal of the plug after contacting the first contact, and is insulated from the first and second contacts. Providing a contact and first and second resistors for applying a divided voltage of a DC power source to the gate electrode of the MOSFET ;
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 point , respectively. DC outlet. In the DC outlet according to claim 1 ,
Wherein the pre-Symbol third contact provided at a position in contact with the first terminal of said inner in than the first contact, and the plug provided in the insertion mouth for the first terminal of the plug DC outlet.

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