JPS60162363A - Telephone device - Google Patents

Abstract

PURPOSE:To transmit two information on a conduction mode and a service interruption mode by holding a call state or switching automatically this call state according to an active or inactive state of a telephone talking circuit in a switching mode between the conduction and service interruption states. CONSTITUTION:A pair of power supply cables 71 are used as communication lines in a service interruption mode. At the same time, automatic changeover switches 14-1 and 14-2 are provide into a telephone 200. When a conduction state is changed to a service interruption state, a calling route is held and then changed to a service interruption calling route by an automatic service interruption switching circuit 60 owing to an on-hook mode. No current flows to the circuit 60 in a conduction state lasting from a call mode of the calling route in a service interruption mode. Thus a call state is held and a normal call mode is reset by an on-hook state. Therefore no manual operation is needed when a call is through.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a telephone exchange system, such as an automatic branch exchange system or a key telephone system, in which a call path switch is provided in a solid device and the switch is remotely controlled from a terminal. It relates to a circuit that enables communication with a telephone line.

A conventional device of this type is disclosed in Japanese Patent Application Laid-Open No. 57-25767, which is manually controlled both during power outage and recovery from power outage.
JP-A-57-131191 ``Telephone device'' that uses both automatic control using a plunger that operates when power is restored and manual control using a manual changeover switch during power outage
has been proposed, but in the event of a power outage, it is necessary to manually change the changeover switch, so some people try to make a call without changing the changeover switch, or they forget to return the changeover switch to its original state after the end of a call, resulting in a call after the power is turned on. This has the disadvantage of causing inconvenience to users.

In order to eliminate these drawbacks, the present invention utilizes a pair of power supply cables, which have recently begun to be widely used in button telephone devices and the like for switching during a power outage, as a communication line during a power outage.
In addition, an automatic changeover switch is installed inside the phone to maintain the previous call status when changing from a power-on state to a power-off state, or from a power-off state to a power-on state, and to eliminate the need for manual operation even when a call ends. To provide a telephone device which enables telephone calls on lines corresponding to power outages and energizations, respectively.

The present invention will be described in detail below using the drawings.

FIG. 1 shows an embodiment of the present invention excluding the details of the automatic power failure switching circuit. In Figure 1, ■, 7 is a relay, 1-1
．． 1-2 is the contact of relay 1, 7-1 is the contact of relay 7,
1.4-1 and 14-2 are contacts of the latching relay 14 provided in the automatic power failure switching circuit 6o as described later;
~6, 10.11 is a diode, 2 is a relay driver,
8 is a resistor, 9 is a communication path switch matrix that is maintained during a power outage, 12 is a communication monitoring relay, and 12-1 is a relay 12
13 is the telephone communication circuit, 100 is the main device (ME
), 200 is a button telephone (KT), 70 is a telephone line, 7
1 is a pair of wires normally used for power supply. In addition, FIG. 1 only shows the part related to the power outage automatic switching circuit of the button telephone device, and other circuit parts are not related to the present invention and can be realized by known means, so they are omitted here. be.

Next, the operation of the embodiment shown in FIG. 1 will be explained. First, the non-call mode when no call is being made will be explained. Suppose now that the key telephone 200 is not making a call due to a power outage condition.

At this time, since a communication loop is not formed for the relay 7, the contact 7-1 of the relay 7 is tilted toward the solid line side.

When power is applied from this state, relay 1 causes contacts 1-1, 1-2 of relay 1 to go to the dotted line side, and automatic power failure switching circuit 6
Depends on 0.

Contact points 14-1 and 14-2 of the ching relay 14 are on the dotted line side (first state). If you make a call in this state, the telephone call circuit 13 will
1 and 14-2 are connected to the central office line through a communication line 70 and a communication path switch matrix 9, and communication is possible. At this time, power is supplied between the main device 100 and the key telephone 200 using the pair of wires 71. In other words, [power supply ■→
Dotted line side of contact 1-2 → one side of pair 71 → automatic power failure switching circuit 60 (power supply smoothing circuit 65 → power input section of each part → power supply smoothing circuit 65) → diode 11 → other side of pair 71 → contact 1-1 DC power is supplied via the dotted line side → ground] route. As described above, a circuit for supplying power supply current necessary for the operation of the key telephone device when energized and for making calls is formed.

Next, when the power is turned on, if a power outage occurs from a state where no telephone calls are being made, the power supply (2) is cut off, so that the relay 1 is restored to the solid line side. The automatic power outage switching circuit 60 causes the contacts 14-1 of the latching relay 14 to close. .

14-2 is restored to the solid line side (second state). here,
The diodes 3 to 6 constitute a rectifier circuit that always provides an output with a constant polarity even when the polarity of the station line changes. Further, the relay 7 is a call monitoring relay during a power outage, and the contact 7-1 is on the dotted line side when it is in operation, and on the solid line side when it is not in operation. Now, if you enter a power outage call state and the polarity of the office line is upper side, the communication circuit will be as follows: [Office line (upper side) → Diode 3 → Relay 7 → Solid line side of contact 1-1 → One side of paired wire 71 → Diode 1o → U, contact 14 of ching relay 14
Solid line side of -2 → Call circuit 13 → Call monitoring relay 12 → U, Solid line side of contact 14-1 of Ching relay 14 → Pair a71
→ solid line side of contact 1-2 → diode 6 → central office line (lower side)] to enable communication.

Here, the power supply smoothing circuit 65 and the power failure automatic switching circuit 60
The diode 11 prevents current from flowing in the direction.

Next, the operation of the call mode when the power is turned on during a call and then a power outage occurs, and when the power is turned on during a call when the power is turned on will be further explained with reference to FIG.

FIG. 2 shows an example of the structure of the automatic power failure switching circuit 60. 1
4 is a two-winding latching relay, 15 is a transistor, 1
8 is a diode, 16 and 17 are resistors, 19 is a capacitor, and 12-1 is a contact point of the call monitoring relay 12 shown in FIG.

Assume that there is currently a power outage and telephone 200 is not making a call. When energized in this state, power is supplied to the automatic power failure switching circuit 60 through the power supply route, and the S winding side of the latching relay 14 is operated, as shown in FIG.
4 contacts 14-1 and 14-2 are on the dotted line side (first state). Further, the capacitor 19 is charged through the diode 18. Subsequently, when the communication state is entered, the contact 12-1 of the relay 12 becomes the dotted line side, and the communication circuit 13 can communicate with the central office line through the communication line 701 and the communication path switch 9. Furthermore, if there is a power outage, contact 14-1.14 of ching relay 14
-2 maintains the first state at that time, so the call route is maintained. At this time, 19 capacitors were discharged! Since there is no luh, it remains charged.

Next, when the call ends, the contact 12-1 of the relay 12 becomes the solid line side, and the charge in the capacitor 19 begins to flow through the emitter and base of the transistor 5 and the resistor 17, and the voltage between the emitter and base of the transistor 15 is increased by the resistor 16, conducts between the emitter and collector of the transistor 15, passes through the second winding side of the latching relay 14, and discharges through the solid line side of the contact 12-1 of the relay 12 17.

This operation causes contacts 14-1 of latching relay 14.
14-2 is on the solid line side (second state).

In this manner, when a power is cut from a current call state and the call is terminated, the automatic power outage switching circuit 6o switches to the power outage call route.

Next, a description will be given of power supply during a call during a call route during a power outage. Now the call circuit 13 is [latching relay 14
Contact 14-1, solid line side of 14-2 → diode 10 →
It is connected to the central office line through the path of power supply @ 71 → solid line side of contacts 1-1j-2 of relay 1 → relay 7 → diode bridges 3 to 6] and can make a call. At this time, since the call is in progress, the relay 7 is activated, and its contact 7-1 is on the dotted line side.

If you turn on the power in this state, the relay will not operate.
The contact point 1-1, 1. -2 remains a solid line. Therefore, since no current flows through the power failure automatic switching circuit 6° due to blocking by the diode 11, contact 1 of the latching relay 14
4-1 and 14-2 remain on the solid line side (second state) and the call is maintained. When the call is further terminated, the call route disappears and relay 7 is restored, and contact 7-1 of relay 7 (and contact 12-1 of relay 12) returns to the solid line side, so relay 1 operates, and contact 1-1 of relay 1 returns to the solid line side. 1.1-2 operates to the dotted line side, and current flows to the automatic power failure switching circuit 60, so the S winding side of the latching relay 14 operates, and the contacts 14-1 and 14-2 of the ching relay 14 move to the dotted line side. side (first
state) and returns to normal power supply mode.

FIG. 3 shows a configuration example in which the automatic power failure switching circuit 6o of FIG. 2 is partially modified. Here, 20, 21, 26.28 are resistors, 22.23 is a diode, 24 is a constant voltage diode,
25 and 27 are transistors. 2o is a current reduction resistor on the S winding side of the latching relay 14.

The resistor 28 is a resistor for reducing the base current of the transistor 25,
The resistor 21 is a resistor for preventing destruction of the diode 18 and transistor 27 due to rush current. The diode 22 protects the transistor 25, and the diode 23 protects the transistor 15 from reverse breakdown voltage. The transistor 25 is used to drive the S winding side of the ching relay 14, and the constant voltage diode 24 determines the operating voltage of the transistor 25. In other words, when the power is turned on from a power outage state, the latching relay 1 is
No. 4 S winding operates.

On the other hand, if a power outage occurs from a energized state, the voltage regulator diode 2
Below the operating voltage of 4, the S winding of the latching relay 14 loses its holding power. At the same time, the charge in the capacitor 19 is changed from [transistor 15 → P winding of latching relay 14 → transistor/
The latching relay 14 is operated by two windings.

The transistor 27 is used to rapidly discharge the voltage applied between AB when the voltage applied between A and B at the time of a power outage drops gradually. That is, when the charge in the capacitor 19 starts discharging and current starts flowing to the second winding side of the latching relay 14 through the base and emitter of the transistor 27, the base and emitter of the transistor 270
The voltage between the emitter and the rim is increased by the resistor 26, causing conduction between the collector and the emitter of the transistor 27, and the resistor 21
The voltage across ab is rapidly lowered throughout. Also, resistor 28
One end not connected to the constant voltage diode 24 may be connected to a or the connection point of the resistors 21 and 17.

As described above, according to the configuration example shown in FIG. 3, stable operation can be obtained even when the power supply has smooth rise and fall characteristics.

FIG. 4 shows a hook switch 40-1 which interlocks the call monitoring relay 12 and its contact 12-1 in FIG.
It is replaced with 40-2. By using a hook switch, it is possible to configure the system without using an element that causes call loss, such as a call monitoring relay.

In FIG. 5, the constant operation of the S winding of the latching relay 14 in FIG. 3 is changed to pulse drive. Here, 31 is a transistor, 29 and 32 are diodes, and 30 is a resistor. When a voltage is applied between ab and
→ Since current flows through the route of the capacitor 9], conduction occurs between the emitter and collector of the transistor 31, and the S winding of the ching relay 14 operates. When the capacitor 9 is charged, no current flows between the emitter and base of the transistor 31, and the emitter and base of the transistor 31 are
・Current no longer flows to the collector. The diode 32 is turned off during a power outage if the telephone call monitoring system is configured with a hook switch and if the office line is accommodated without the diode 32, it will be turned off during a power outage. When the phone is disconnected from the handset and the power is turned on again, the ching relay
This is to prevent the S winding No. 14 from not operating until on-hook.

In FIG. 1, the power supply line 71 can be realized by a line in which a control signal is superimposed on a power supply. In addition, if power fluctuations are large, the automatic power failure switching circuit 60 shown in FIGS. 1 and 4 may be connected in parallel with the power input section of each section after the power supply smoothing circuit 65 as shown in FIG. .

Further, in FIGS. 2, 3, and 5, a battery 7 is used as the means, but a battery can also be used.

As explained above, when switching from power on to power outage, and from power outage to power on, the phone call circuit maintains the call or automatically switches the state depending on whether or not the phone is talking, so that It enables the transmission of two types of information.

As explained above, according to the present invention, in a telephone system such as an exchange, a key telephone device, a line concentrator, etc., in which a call changeover switch is installed in a solid device and a call changeover operation is performed, it is possible to automatically switch calls without having to manually switch calls. This makes it possible to switch calls during a power outage, and has the effect of solving the problem of not being able to make calls due to erroneous operation.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. FIGS. 3 and 5 are circuit diagrams showing specific examples of the automatic power failure switching circuit used in the present invention, and FIGS. 4 and 6 are circuit diagrams showing partially modified examples of the telephone used in the present invention. Patent Applicant Iwasaki Tsushinki Co., Ltd. Nippon Telegraph and Telephone Public Corporation Kanda Tsushin Kogyo Co., Ltd. Nakayo Tsushinki Nippon Telecommunications Kogyo Co., Ltd. Inuko Electric Manufacturing Co., Ltd. Agent Manabu Otsuka Tsuneo Mizu Continued from page 1 @ Inventor Eng. Ken Fuji Inventor Toshifumi Hoshino Inventor Tadashi Kobayashi @ Inventor Ceiling Yasushi0 Inventor Takiguchi Seidai Inside Nippon Telegraph and Telephone Public Corporation, 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo

Claims (1)

[Claims] One end of the telephone line is connected to the central office line via a telephone line switch in the main unit, and a pair of cables is provided separately from the telephone line. In a telephone device that is connected to a power source and configured to be connected to the office line side with a polarity opposite to that of the DC power source in the event of a power outage, it is possible to determine whether the telephone is in a call state or a non-call state. monitoring means for outputting an output indicating the communication line; and a contact that takes either a first state in which the telephone communication circuit of the telephone set is connected to the other end of the telephone line or a second state in which the communication circuit of the telephone set is connected to the other end of the pair of cables. a latching relay having a latching relay; an energy accumulating means that accumulates energy during energization and discharges the accumulated energy when the monitoring means outputs an output indicating that the communication is not in a non-call state during a power outage; When a signal indicating a non-call state is issued, K is a non-call mode in which the contact of the launching relay changes between the first state and the second state during power supply and power outage. and when the monitoring means outputs an output indicating that the communication is in the talking state, the contacts of the latching relay are in the second state or the first state at the time of transition from power outage to energization or from energization to power outage. By setting the call mode in which each state is temporarily held, the call state is maintained, and when the call state ends, the energy stored in the energy storage means is released, and the contacts of the latching relay are 1. A telephone device comprising: a driving circuit for controlling the telephone to return to a non-call mode.