JP2626911B2 - Remote carving device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote separation device for connecting and disconnecting a communication line and a home device remotely from a telephone station or the like.

[Conventional technology]

When a communication line, for example, a telephone line breaks down, if the telephone line can be connected and disconnected remotely from a telephone station or the like, the location and content of the failure can be easily known.

The arrangement of the remote cutting device is shown in FIG. The remote separating device 3 is connected to the telephone station 1 via the communication line 2.
In-home devices 5 such as telephones are connected by an indoor line 4. In FIG. 5, the remote isolating device 3 receives a control signal from a control device in a telephone station (not shown),
The communication line 2 is connected and disconnected.

Conventionally, many types of remote isolation devices of this type have been proposed. However, as a control method of the remote isolation device for connecting and disconnecting the communication line 2 by remote control, a voltage is applied between the communication line and the ground. A vertical voltage control method to be applied is used.

An example of the remote isolation device using the vertical voltage control method is shown in FIG.
It is shown in the figure (JP-A-59-44161).

In this example, the remote isolation device 40 is connected to a telephone office via communication lines 24 and 25, to a home interior via indoor lines 27 and 28, and to ground via a ground line 26.
The remote isolating device is activated by transmitting a positive voltage to the ground via a communication line 24 or 25 from a control device in a telephone station (not shown). That is, when a positive voltage is applied to the communication line 24 with respect to the ground, the resistance 4
6, Diode 45, Diode 44, Capacitor 53, Ground wire 26
Charging current flows to the capacitor 53 through the
Accumulates charges. The resistor 49 is selected as a high resistor, and its effect can be ignored. After a lapse of time equal to or more than the completion of charging of the capacitor 53, the control device (not shown) stops sending the voltage to the communication line. At this time, the capacitor 53 is connected to the transistor 50 by an emitter of the transistor 50,
A base current is supplied to the transistor 50 through the path of the base and the resistor 49. This base current increases the collector current due to the current amplifying action of the transistor 50. Accordingly, the emitter current of the transistor 50, that is, the sum of the base current and the collector current flows through the winding 52 of the switching relay, and the relay common contact 3
1 and 33 are energized and are switched from the contacts 30 and 32 to the contacts 34 and 43. With the above operation, the communication line and the indoor line are disconnected,
The telephone office can test only the communication line.

[Problems to be solved by the invention]

In the conventional vertical voltage control system, grounding is required for control via grounding.A high voltage may appear between the communication line and the ground due to induction from a power line or the like. There are drawbacks such as the possibility of malfunction and damage, requiring protection.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a remote isolation device that does not require a ground and is stable in operation by a lateral voltage control method.

[Means for explaining the task]

In order to achieve the above object, the present invention provides a remote separation device for remotely connecting and disconnecting a communication line and a home device by using a DC control signal, wherein the remote separation device is inserted between the communication line and the home device, A contact for connecting / disconnecting a line to / from the home device, a contact drive circuit between two lines constituting the communication line, and a control signal having a function of removing an AC signal and controlling connection / disconnection of the communication line A contact drive circuit that is continuously energized while a control signal is present, and wherein any one of the contact or the contact drive circuit or the control signal determination circuit includes state storage means. Features.

Further, in a remote separation device for remotely connecting and disconnecting a communication line and a home device using a DC control signal, the remote separation device is inserted between the communication line and the home device to connect and disconnect the communication line to the home device. A contact to be disconnected, a contact drive circuit between two wires constituting the communication line, a control signal determination circuit having a function of removing an AC signal and controlling connection and disconnection of the communication line, and the control signal determination circuit A drive circuit that controls the operation of the contact drive circuit that is controlled based on the determination result, wherein the contact drive circuit is continuously energized while a control signal is present, and the contact or the contact drive circuit or A state storage means is provided in any of the control signal determination circuits.

(Operation)

The present invention disposes a contact between a communication line and a home device (indoor line), arranges a control signal determination circuit having a function of removing an AC signal and a contact drive circuit between two lines constituting the communication line, and includes a contact or a contact. The most important feature is that at least one of the drive circuits is provided with a state storage function, and is different from the prior art in that grounding is not required.

According to the present invention, a contact is disposed between a communication line and a home device, a control signal determination circuit and a contact drive circuit are disposed between two lines constituting the communication line, and a state storage function is provided in at least one of the contact and the contact drive circuit. Has the advantage that a remote separation device operable without using the ground can be realized.

Further, it is possible to control the contact drive circuit directly, that is, continuously, to prevent a malfunction due to a high voltage AC signal such as a call signal, to achieve high reliability of operation, and to realize a remote disconnecting device according to the present invention. It is suitable for miniaturization because it is simple, and can be installed at any place of the communication line. Hereinafter, embodiments will be described with reference to the drawings.

〔Example〕

Embodiment 1 FIG. 1 shows a first embodiment of the present invention, in which 100 is a remote disconnection device, 101 and 102 are communication lines, 103 and 104.
Is an indoor line, 105 is a control signal determination circuit, 110 is a known bridge circuit, 111 is a polarized contact drive circuit, 112 is a control signal determination unit, 113 is a contact, 114 is a termination circuit, and 120 to 125 are contacts. Each part, 130 to 133, represents a diode constituting a bridge circuit, and the same symbols in the following embodiments indicate the same objects.

Next, the operation will be described. When the remote separation device is operated, a voltage (for example, ± 48) used for normal communication is provided between a communication line 101 and a control device (not shown) in a switching center (not shown).
V) or more DC voltage (for example, ± 100 V), that is, a control signal is applied.

When a DC voltage of +100 V is applied to the other line 101 of the communication line with respect to one line 102 of the communication line, the control signal determination circuit 105
, A voltage applied between the communication circuits 101 and 102 via the polarized contact drive circuit is applied. The control signal determination circuit 105 determines whether or not a voltage obtained by removing an AC signal component from the voltage applied between the communication lines 101 and 102 is a control signal. If the control signal is determined to be a control signal, a current flows. Accordingly, a current flows from the control signal determination circuit 105 to the communication line 102 side in the polarized contact drive circuit, and this current continues to flow while the control signal is applied, energizing the contact 113, and moving the movable contact. 120 and 121 are fixed contacts 12
Then, the indoor lines 103 and 104 are disconnected from the communication lines 101 and 102, and a terminal circuit 114 is connected to the communication lines 101 and 102.

A control signal in the reverse direction between the communication lines 101 and 102, that is, a voltage of -100 V is applied to the other line 101 of the communication line with respect to the line 102 of the communication line.
When the voltage is applied to the control signal determination circuit 105, the control signal determination circuit 105 conducts a current in the same manner as described above. Since the circuit is polarized, the contact 113 is urged in the reverse direction. As a result, the communication lines 101 and 102 are disconnected from the terminal circuit 114 and connected to the indoor lines 103 and 104, and eventually return to the original state.

Here, by providing the polarized contact drive circuit 105 or the contact 113 with a state storage function, the state of the contact can be maintained even after the control signal is stopped.

As a contact having a memory function, a magnetic latch type or a mechanical latch type is known.

Polarized contact drive circuits with a memory function include those that use magnetic materials with large hysteresis characteristics for magnetic circuits, and those that use solid-state relays that use semiconductor elements.
Various forms are possible, such as those utilizing the storage action of a capacitor provided at the gate of a transistor, and the use of an ultra-low power consumption flip-flop circuit using CMOS technology.

The termination circuit 114 can take various forms depending on the purpose, such as an open circuit or a series circuit of a resistor and a capacitor.

In some cases, a high-voltage AC signal is used together with a communication line for the purpose of a call signal or the like.In order to prevent a malfunction when such a high-voltage AC signal is applied, the control signal determination circuit 105 It also has an AC signal removal function. In order to realize such a function, it is effective to utilize the active filter technology. However, in general, a semiconductor element can only handle a current in one direction. In such a case, as shown in FIG. 1, an active filter technique is used by coupling a control signal determination unit via a bridge circuit 110. The technical signal determination circuit 105 can be economically configured. It goes without saying that this technique is also effective when a single determination circuit is shared for bidirectional control signals.

Further, there is a latch type relay in which a set winding and a reset winding are separated as shown in FIGS. 2a and 2b.
By the connection shown in FIGS. A and b, it can be treated substantially equivalent to a single-winding polarized relay.

In FIGS. 2a and 2b, 220 is a relay, 200 is a set winding, 201 is a reset winding, and 202 and 203 are diodes.

In FIG. 2A, when a positive voltage is applied to the 210 side, a current flows through the set winding 200 via the diode 203,
When a voltage in the opposite direction is applied, a current flows through the reset winding 201 via the diode 202, and is eventually equivalent to a single-winding type polarized relay. FIG. 2b differs in that the winding is bypassed by a diode, but is likewise equivalent to a single-winding type polarized relay.

The object can also be achieved by providing a control signal determination circuit for each detection polarity and connecting a set winding and a reset winding to each of them.

Furthermore, although the contacts shown in this embodiment are of the switching type, only the necessary contacts need to be provided in practical use. For example, when the terminal circuit 114 is open, the contacts may be of the cut type. If the purpose is to separate the side from the loop, the contacts can be inserted on only one of the two wires.

As is apparent from the above description, according to the present embodiment, there is an advantage that it is possible to realize a remote separation device that can be controlled without using the ground.

Embodiment 2: FIG. 3 is a view for explaining a specific configuration of a remote separation device according to the present invention, where 73 and 74 are input terminals, 75 and 76 are output terminals, and 77, 78, 79 and 80 are Diodes, 81 and 84 are resistors, 82 is a Zener diode, 83 is a capacitor, 85 is an NPN transistor, 99 is a relay, 86 is a relay coil, 89, 90, 91, 9
2,93,94 are relay contacts, and 88 is a termination circuit. This operation will be described. The input terminals 73 and 74 are respectively connected to the communication line side, and the output terminals 75 and 76 are respectively connected to the indoor line side (terminal apparatus side). When a DC voltage of, for example, 100 V is applied from the input terminal 73 to the input terminal 74, a current flows in the forward direction of the diodes 77 and 78, charges are accumulated in the capacitor 83 through the resistor 81, and the potential of the capacitor 83 is reduced. When the voltage rises above the Zener voltage, the Zener diode 82
It becomes ON, and current flows to the base of the NPN transistor 85 to turn on the transistor 85. Since the resistor 81 and the capacitor 83 function as a low-pass filter, the AC signal is removed, and malfunction due to a high-voltage AC signal such as a ringing signal can be prevented. Further, the low-pass filter including the resistor 81 and the capacitor 83 can have a high impedance due to the amplifying action of the transistor 85, and a small-capacity capacitor can be used as the capacitor 83. This part of the circuit can be regarded as a simple active filter. Where the resistance
Reference numeral 84 serves to protect the NPN transistor from malfunction due to leakage current between the collector and the base. When the NPN transistor 85 is turned on, a large current flows through the diodes 77 and 78, a positive current flows through the relay coil 86, and this current continues to flow while the control signal is applied, and operates the relay contacts 89 and 92. And the relay contacts 89 and 91 and the relay contacts 92 and 94 are connected, and the relay contacts 90 and 93 are opened. At this time, the communication line is terminated by the termination circuit 88. To change from the terminated state to the normal state, the input terminal 74 is connected to the input terminal 73.
, I.e., the same DC voltage is applied in the direction opposite to that during driving. At this time, the NPN transistor 85 turns ON by the same operation as above.
I do. When the NPN transistor 85 turns on, the relay coil 86
Current flows in the reverse direction to urge the relay contacts 89 and 92 in the recovery direction, and the relay contacts 89, 90 and 92
And the relay contact 93 are connected to restore the normal state.

Embodiment 3 FIG. 4 is a view for explaining a third embodiment of the present invention, and the same reference numerals as those in FIG. 1 denote the same parts. 145 is a control signal determination circuit, 146 is a drive circuit, 147 is a control signal determination circuit
The determination output of 145 represents a control line for controlling the drive circuit 146.

The control signal determination circuit 145 in the present embodiment separates, as the drive circuit 146, the function of passing a current when the applied voltage is determined to be a control signal among the functions of the control signal determination circuit 105 in the first embodiment. Things. With this configuration, the control signal determination circuit 145 can be freely arranged, and can be directly connected between two communication lines. CM with recent integrated circuit technology
By using OS process technology, digital filter technology, etc., it is possible to easily determine and store control signals with ultra-fine power.

Next, the operation will be described.The control signal determination circuit 145 is connected to the communication lines 101 and 102, and the control signal determination circuit 145 determines that the voltage applied between the communication lines 101 and 102 is a control signal. The output is output to the control line 147. The control line 147 is connected to the drive circuit 146, and the drive circuit 146 is energized by the determination output to pass a current.
This current continues to flow while the control signal is applied. Subsequent operations are the same as in the first embodiment. The control signal determination circuit 145 and the drive circuit 146 are equivalent to the control signal determination circuit 105 in the first embodiment. Therefore, the state storage function can be added to both the control signal determination circuit 145 and the drive circuit 146. it can.

As is clear from the above description, the control signal determination circuit 14
It can be seen that 5 can be freely arranged if it is a portion to which the control signal information is applied.

〔The invention's effect〕

As described above, according to the present invention, a contact is disposed between a communication line and a home device, a control signal determination circuit and a contact drive circuit are disposed between two lines constituting the communication line, and a contact or a contact drive circuit is provided. Since at least one of them has the state memory function, there is an advantage that a remote separation device that can be driven without using the ground can be realized.

Further, it is possible to control the contact drive circuit directly, that is, continuously, and, by the AC signal removal function provided in the control signal determination circuit, it is possible to prevent malfunction due to a high voltage AC signal such as a call signal, The operation can be made highly reliable, and the remote separation device according to the present invention has a simple configuration, so that it is suitable for miniaturization, and can be installed at any location on the communication line.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention, FIGS. 2a and 2b are embodiments of a latch type relay according to the present invention, FIG. FIG. 4 is a configuration diagram of a third embodiment of the present invention, FIG. 5 is a configuration diagram of a remote separation device, and FIG. 6 is a configuration diagram of a conventional remote separation device example. 100 remote separating apparatus 101, 102 communication line 103, 104 indoor line 105 control signal determination circuit 110 bridge circuit 111 polarized (state storage) contact drive circuit 112 control signal determination unit 113 ... Contact 114 ... Terminal circuit 120-125 ... Parts of contact 130-133 ... Diode 220 ... Relay 200 ... Set winding 201 ... Reset winding 202,203 ... Diode 210,211 ... Explanation symbol 73, 74 Input terminal 75,76 Output terminal 77 to 80 Diode 81,84 Resistor 82 Zener diode 83 Capacitor 85 NPN transistor 99 Relay 86 Relay coil 89 to 94 relay contact 88 termination circuit 145 control signal determination circuit 146 drive circuit 147 control line 1 telephone office 2 communication line 3 remote disconnection device 4 indoor line 5 …… Home equipment 24,25 …… Communication line 27,28 …… Indoor line 26 …… Ground line 52 …… Switching relay winding

Claims (2)

(57) [Claims] 1. A remote separating apparatus for remotely connecting and disconnecting a communication line and a home device by using a DC control signal, wherein the remote communication device is inserted between the communication line and the home device and connects the communication line to the home device. A contact driving circuit between two lines constituting the communication line, and a control signal determining circuit having a function of removing an AC signal and controlling connection / disconnection of the communication line. The contact drive circuit is continuously energized while a control signal is present, and is provided with state storage means in either the contact or the contact drive circuit or the control signal determination circuit. Dividing device. 2. A remote separating apparatus for remotely connecting and disconnecting a communication line and a home device by using a DC control signal, wherein the remote communication device is inserted between the communication line and the home device to connect the communication line to the home device. A contact driving circuit between two wires constituting the communication line; a control signal determining circuit having a function of removing an AC signal and controlling connection / disconnection of the communication line; A drive circuit that controls the operation of the contact point drive circuit that is controlled based on the determination result of the control signal determination circuit,
A contact drive circuit that is continuously energized while a control signal is present; and wherein the contact or one of the contact drive circuit and the control signal determination circuit includes state storage means. .