JPH10117413A - Power supply cable device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an identifying part of the kind (length) of a panel side cable to be connected with it on a power supply side cable, when a power cable connecting a power supply with a panel part is cut into a power supply side and a panel side, and the panel side cables in different lengths and the power supply side cables to be connected with each panel side cable are provided. SOLUTION: Power supply cables are cut into power supply side cables 11, 11' and panel side cables 13, 14 and they are connected at a connecting part 12. The power supply side cable 11 and panel side cable 13 constitute a power cable of approximately 10m long, while the power supply side cable 11' and the panel side cable 14 do that of approximately 5m long. A voltage change-over part for correcting the amount of voltage droop in the cables is provided at the power supply connecting parts 15, 15'. The lengths of ground connecting wires at the connecting part 12 of the power supply side cable 11, 11' are set individually, so that the kinds (lengths) of the panel side cables to be connected with can be identified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply cable for supplying power from a power supply section to a panel section. The power supply cable is divided into a power supply side cable and a panel side cable having a plurality of lengths. The present invention relates to a cable provided with a panel-side cable length identification section to be connected.

[0002]

2. Description of the Related Art Plasma display panels (PDPs)
A display device using a PDP has a thin panel structure by taking advantage of the fact that a PDP is a display device having a small depth. The power supply unit is configured to supply power to the panel unit.For example, when the panel unit is installed on a vehicle such as a bus, the panel unit is installed near the passenger seat, and the power supply unit is installed in a place where it does not interfere with passengers. In consideration of the fact that the distance between the unit and the panel unit varies, a plurality of power cables having different lengths are provided so that they can be selected as appropriate. by the way,
As shown in FIG. 1, the power cable 3 is connected to the P
Voltage Vs for plasma discharge of DP, voltage for logic circuit
Vd, a signal (voltage) Vr sent from the panel unit 2 to the power supply unit 1 for controlling the discharge voltage Vs, and a ground connection line. The plasma discharge current is, for example, several microseconds. Since a maximum current of several amps flows between them, the voltage drops even with a slight resistance of the power cable 3,
At the output terminal of the power supply unit 1, even if the voltage is normal, the panel unit 2
In some cases, the voltage may fall outside the allowable voltage range of the PDP. To compensate for the voltage drop, the output voltage of the power supply unit 1 may be set higher. However, the allowable voltage of the PDP has an upper limit and a lower limit. In fact, the output voltage of the power supply must be switched according to the length of the power cable used.

By the way, the power supply cable 3 is connected to a power supply side cable 11 as shown in FIG.
(Or 11 ') and panel side cable 13 (or 14)
One end of each cable is connected to the power supply unit 1 and the display panel unit 2 in advance, and these cables are connected in the middle at the time of installation, and the connection point of the cable is close to the power supply unit 1. Position. The panel-side cable has two types, a long cable 13 and a short cable 14. The connector 15 of the power cable 11 (or 11 ') is provided.
(Or 15 ') is provided with a switching unit (changing the pin number of the ground connection terminal to the power supply unit for each length, and switching the output voltage from the power supply unit in accordance with the length) to adjust the output voltage of the power supply. Switching is performed according to the length of the panel side cable. Therefore, the power supply side cable 11 (11 ') and the display panel side cable 13 (14) must be used in pairs, but the difference in length of the display panel side cable 13 (or 14) can be seen at a glance. The power supply side cables 11 and 11 ′ cannot be distinguished from the appearance. For example, when the long power supply side cable 11 and the short panel side cable 14 are connected, the voltage on the panel unit 2 side is within the allowable range. This causes problems such as exceeding. For this reason, a label is attached to the power supply side cable and the type (length) of the panel side cable to be connected is displayed, but the label may be cut off or peeled off and lacks reliability. There is.

[0004]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention provides a panel-side cable to be connected (combined) at a glance without looking at the label. The purpose is to make it possible to identify the type (length).

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a power supply cable for supplying a DC voltage, which has been made constant by a power supply unit, to a panel unit which displays a video signal based on a video signal. A power supply side cable for connecting the panel side cable to each of the panel side cables; and a power supply side cable for connecting the panel side cable to each panel side cable. A power supply cable in which a power supply output voltage switching section for correcting a voltage drop in a panel side cable is provided at a power supply connection section of the cable, wherein the power supply side cable is provided with an identification section of a panel side cable to be connected. An apparatus is provided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a power cable apparatus according to the present invention, a power supply side cable having a power supply output voltage switching section for correcting a voltage drop in the panel side cable at a power supply connection section is connected to a ground connected to the panel side cable. The length of the connection line is set to be longer or shorter according to the length of the panel-side cable. At first glance, this ground connection line indicates the type of the panel-side cable to be connected (to be combined) based on its length. ) Is identifiable.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a power cable device according to the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram of a power cable device according to the present invention, FIG. 2 is a configuration diagram of an example of a power cable, and FIG. 3 is a diagram showing an embodiment of the power cable device according to the present invention.

In FIG. 1, 1 is a power supply unit, 2 is a panel unit, and 3 is a power cable. The panel unit 2 is configured using a PDP, and displays an image based on a supplied image signal. The panel unit 2 receives the voltage Vs for plasma discharge of the PDP and the voltage Vd for the logic circuit from the power supply unit 1 via the power supply cable 3, and supplies the voltage Vs to the power supply unit 1.
Control voltage Vr for controlling the control voltage Vr. Since the current for plasma discharge flows, for example, about several amperes at maximum within several microseconds, the voltage drop due to the resistance of the electric wire of the power supply cable 3 is large, and the output voltage Vs of the power supply unit 1 is reduced to compensate for this voltage drop. It is necessary to switch according to the length of the power cable 3.

As shown in FIG. 2, for example, the power cable 3 includes a power cable 11 (11 ') and a panel cable 13 (1).
4) and the two are connected at the intermediate connection section 12. In the example shown in the figure, the power supply side cables 11 and 11 'are both about 0.5 meters, the connection section 12 is about 0.5 meters, and the panel side. The cable 13 (for long) is about 8.8 meters, the panel-side cable 14 (for short) is about 3.8 meters, and the combination of the power-side cable 11 and panel-side cable 13 is about 10 meters, and the power-side cable 11 'and panel A power cable of about 5 meters is used in combination with the side cable 14.

A power supply output voltage switching section for correcting a voltage drop with an electric wire of about 10 meters is provided at a power supply connection section (constituted of a circular connector or the like) 15 of the power supply side cable 11. Approximately 5 at power supply connection 15 'of 11'
A power supply output voltage switching unit is provided for correcting a voltage drop in a meter wire. These power supply output voltage switching units
For example, the position (number) of the ground connection pin is
The power supply unit 1 switches the output voltage of the constant voltage circuit according to the number connected to the ground connection pin of the power supply side cable.

As shown in FIG. 3, power supply side cables 11 and 1
The length (L) of the ground connection line 21 is different from that of 1 ', so that the type (length) of the panel-side cable to be connected (combined) to these can be determined by looking at this length.
For example, the length (L) of the ground connection line 21 is set long for a long panel-side cable (13) to be combined and short for a short panel-side cable (14).
For example, a black-coated wire is used so as not to be mistaken for another wire.

[0012]

As described above, according to the power cable apparatus of the present invention, the type (length) of the panel side cable to be connected can be identified by the length of the ground connection line of the power side cable. It is highly reliable because it is not lost during handling as in the case of attaching a label.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a power cable device according to the present invention.

FIG. 2 is a configuration diagram of an example of a power cable device according to the present invention.

FIG. 3 is a view showing one embodiment of a power cable device according to the present invention.

[Explanation of symbols]

 1 Power supply section 2 Panel section 3 Power supply cable 11, 11 'Power supply side cable 12 Connection section 13, 14 Panel side cable 15, 15' Power supply connection section 21 Ground connection line

Claims (4)

[Claims] 1. A power supply cable for supplying a DC voltage, which is a constant voltage by a power supply section, to a panel section for displaying based on a video signal, is divided into a panel side cable and a power side cable, and is detachably connected in the middle. A plurality of lengths of the panel-side cable and a power-supply cable for connecting to each panel-side cable, and a voltage drop at the panel-side cable is corrected at a power supply connection portion of each power-side cable. A power cable apparatus, comprising: a power output voltage switching section for performing the operation, wherein the power side cable is provided with a panel side cable identification section to be connected. 2. The power cable apparatus according to claim 1, wherein the identification section identifies the difference based on a difference in length of a ground connection line of a connection section with the panel-side cable. 3. The power cable apparatus according to claim 2, wherein the length of the ground connection line is set according to the length of the panel-side cable to be connected. 4. The power cable apparatus according to claim 2, wherein the length of the ground connection line is set longer for a longer panel-side cable to be connected and shorter for a shorter panel-side cable to be connected.