JPS6142229A - Interface cable power supply system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an Inter-7Ace cable power supply system, and particularly to information equipment having a power supply line.

The present invention relates to an Inter-7Ace cable source supply system for controlling units of electrical equipment.

(Prior art) Conventionally, this kind of interface 7/8 cable power supply method has been maintained, so if a unit other than the specified power supply unit is connected by mistake, the unit may be destroyed by pressing the button. In some cases, failures may occur on the power supply unit side due to overcurrent or current.

The first way to prevent this situation is to put a label near the interface cable and unit connector, displaying the name and location information of the connected device to alert the operator and prevent this connection. there was.

The second method is to prohibit the use of multiple connectors of the same type in order to prevent physical connection errors. For this reason (if you feel safe using multiple connectors, use a different type of connector, or if you must use connectors of the same shape, use the first
As shown in the diagram, crush a different specific pin for each connector, insert a key-in plug into pin B' on the socket side, and remove pin B' on the plug side to prevent incorrect connection with other connectors. Ta.

Father, the third method is to specify the power supply pin numbers for the same type of cable used for the device, and assign those pins exclusively for power supply, regardless of whether there is a power supply line on each cable. A method was taken.

However, the first method only requires human intervention and cannot be called an 8j-ultimate solution, and the second method involves both production and maintenance due to an increase in the number of cable types.
In addition to increasing management costs, the third method also had the disadvantage that pins designated for power supply could not be used even in cables that did not require power supply, and the pins could not be used effectively.

(Object of the Invention) The present invention eliminates the drawbacks of the conventional interface cable power supply system, and also provides an interface cable power supply that is equipped with a circuit on the power supply unit side that cuts off the power supply in the event that it is connected incorrectly to a unit other than the designated unit. The goal is to provide a supply method.

(Structure of the Invention) According to the present invention, in an information device, an electric device, etc. in which a power supply line is held in an inter-unit connection cable, a disconnection device that is held in a power supply side unit and turns on and off the power supply. An interface cable power supply method characterized in that the contact of the disconnector is turned on or off depending on the presence or absence of a power connection request signal transmitted as an interface signal from the power supply side unit. is obtained.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows one embodiment of the present invention. In FIG. 2, this embodiment shows a state where the interface cable between the keyboard control circuit and the keyboard is connected, and the keyboard (power supplied unit) 4 is connected to the keyboard control circuit (power supply unit) 3 via the cable 50. It is configured so that power is supplied through the

Although the control circuit 3 includes a +5V power supply 3o, it may sometimes exist outside the control circuit 3.

Furthermore, this control circuit 3 has a disconnector 38 that turns on and off the power supply 3o.

In this embodiment, the output from the +5V power supply 3o is connected to the
IfT device contact 38-1 → plug 32 pin A → 50 on the cape (socket 31 pin A' → socket 41 pin A/)
→The flag 42 enters the keyboard 4 via the bin A and is supplied to the keypad internal circuit (not shown).

The ground potential of the source 30 also enters the plug 42 pin B of the keyboard 4 through the same route from the plug 32 pin B. As a power connection request signal, keyboard 4L grag 42 pin C
is grounded inside the keyboard, and plug 42 pin B and pin C are short-circuited, so cable 50 (socket 41 pin C' → socket 31 pin C') → plug 32 pin C of keyboard control circuit 3 → Relay current limiting resistor 36
→Since it is connected to the +5V% source 3o via the relay excitation coil 38-2, the relay contact 38-1 is turned on when the excitation current flows, and is configured to be supplied with the keyboard LCT source +5V.

In this embodiment, even if the cable connection is incorrect and a unit that does not supply power is connected to the keyboard control circuit 3, the plug 42 bin C is always in a state where the relay cannot be energized, for example, the plug 42 bin C of the unit is input. If it is assigned to a signal, the excitation current will not flow, so relay contact 38-1 will rarely turn on, and as a result, even if plug 42 Bin A is connected to the input/output circuit of the logic circuit in a unit other than the keyboard. However, component destruction due to direct application of +5V power cannot occur.

FIG. 3 shows another embodiment of the invention. In Figure 3,
This embodiment is composed of a 7-photocoupler 39 instead of a relay (disconnector), and as in FIG. 2, current flows through the diode Vct current control resistor 36 in the photocoupler only when a predetermined unit is connected. The phototransistor is triggered to turn on by the light emission caused by the current and +5
The V11 source is configured to be supplied to the power supplied circuit 4.

Although the present embodiment describes the positional relationship between the plug and the socket, this may be reversed.

(Effects of the Invention) As explained above, the present invention has the effect of being able to prevent failures due to incorrect connections by turning the supply power disconnector on and off in response to the power connection request signal from the non-power supply unit. .

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a connector in a conventional interface cable, Fig. 2 is a diagram showing an embodiment of the present invention, and Fig. 3 is a diagram showing a connector in a conventional interface cable.
The figure shows another embodiment of the present invention. 3...Power supply side unit, 4...Power supply side unit, 30...Power supply, 38...
...Disconnector, 38-1...Contact, 38-2
...Exciting coil, 39°...Photocoupler. logic! Figure 2

Claims (1)

[Claims] In information equipment, electrical equipment, etc. that maintains a power supply line in the inter-unit connection cable, it is equipped with a disconnector that is held in the power supply side unit and turns on and off the power supply, and is connected to the power supply side unit. An interface cable power supply system characterized in that a contact point of the disconnector is turned on or off depending on the presence or absence of a power connection request signal transmitted as an interface signal.