JPH0311703B2 - - Google Patents

Description

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

As a conventional device of this type, the JP-A-57
No. 25767 "Telephone device" or JP-A-Sho which combines automatic control using a plunger that operates when power is restored and manual control using a manual changeover switch during power outage
No. 57-131191 "Telephone device" has been proposed,
During a power outage, it is necessary to manually switch the switch, so there are cases where people try to make a call without switching the switch, or they forget to return the switch to its original state after the end of a call, resulting in a situation where the call cannot be made. The disadvantage was that it caused inconvenience to people.

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, etc. for switching during power outages, as a communication line during power outages, and furthermore uses an automatic switch inside the telephone. A changeover switch is provided to maintain the previous call status when changing from a power-on state to a power-off state, or from a power outage state to a power-on state, and even when a call ends, it is possible to switch from a power outage without requiring manual operation. To provide a telephone device capable of making calls on lines corresponding to energization.

The present invention will be explained 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, 1 and 7 are relays, 1-1 and 1-2 are contacts of relay 1, and 7-
1 is a contact of the relay 7, 14-1, 14-2 is a contact of the latching relay 14 provided in the automatic power failure switching circuit 60 as described later, 3 to 6, 10, and 11 are diodes, 2 is a relay driver, 8 is resistance, 9
12 is a call path switch matrix that is maintained during a power outage, 12 is a call monitoring relay, and 12-1 is relay 1.
2 contacts, 13 is the telephone call circuit, 100 is the main device (ME), 200 is the button telephone (KT), 70
is a communication line, and 71 is a pair of wires normally used for power supply. In addition, FIG. 1 only shows the portion of the button telephone device related to the switchover call during a power outage, and the other circuit portions are omitted here because they are not related to the present invention and can be realized by known means. There is.

Next, the operation of the embodiment shown in FIG. 1 will be explained. first,
The non-call mode when you are not on a call 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 call loop is not formed for relay 7, contact point 7-1 of relay 7 is tilted toward the solid line side. When power is applied from this state, relay 1 causes contact 1- of relay 1 to
1, 1-2 are on the dotted line side, automatic power failure switching circuit 6
0 makes contact of latching relay 14, 14-
1 and 14-2 are on the dotted line side (first state). When a call is made in this state, the telephone call circuit 13 is connected to the office line through the contacts 14-1, 14-2 of the latching relay 14, the call line 70, and the call path switch matrix 9, and the call can be made. At this time, power is supplied between the main device 100 and the key telephone 200 using the pair of wires 71. That is,
[Power supply → dotted line side of contacts 1-2 → one side of the pair 71 → power failure automatic switching circuit 60 (power supply smoothing circuit 65 → power input section of each part → power supply smoothing circuit 65) → diode 11 → other side of the pair 71 → contact 1-1 dotted line side →
DC power is supplied through the 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 on, if a power outage occurs from a state where no call is being made, the power is cut off and the relay 1 is restored to the solid line side. In addition, the contact 14 of the latching relay 14 is
-1 and 14-2 are restored to the solid line side (second state). Here, the diodes 3 to 6 constitute a rectifier circuit for always obtaining 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 a power outage is entered and the pole name of the office line is (+) on the upper side, the communication circuit will be (office line (upper side) → diode 3 → relay 7 → solid line side of contact 1-1 → pair line 71). On the other hand → diode 10 → solid line side of contact 14-2 of latching relay 14 → talking circuit 13 →
Call monitoring relay 12 → solid line side of contact 14-1 of latching relay 14 → other side of pair 71 → contact 1-
It is connected to the central office line via the solid line side of No. 2 → diode 6 → central office line (lower side) to enable telephone calls. Here, the power supply smoothing circuit 65 and the power failure automatic switching circuit 6
The diode 11 prevents current from flowing in the zero direction.

Next, with reference to FIG. 2, the call mode operation will be further described when power is turned on and the power goes out during a call, and when there is a power outage and the power goes out during a call.

FIG. 2 shows an example of the structure of the automatic power failure switching circuit 60. 14 is a two-winding latching relay, 15 is a transistor, 18 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 power is applied in this state, power is supplied to the automatic power failure switching circuit 60 through the power supply route, the S winding side of the latching relay 14 is operated, and the contact 14- of the latching relay 14 in FIG.
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 70 and the communication path switch 9. Furthermore, even if it stops, the latching relay 1
Since the contacts 14-1 and 14-2 of No. 4 maintain the first state at that time, the communication route is maintained. At this time, the capacitor 19 remains charged because there is no discharge route.

Next, when the call ends, the contact 12-1 of the relay 12 becomes the solid line side, the charge in the capacitor 19 begins to flow through the emitter and base of the transistor 15, and the resistor 17, and the voltage between the emitter and base of the transistor 15 increases to the resistor 16. The voltage rises due to the current, conducts between the emitter and collector of the transistor 15, passes through the P winding side of the latching relay 14, and connects the relay 12.
Discharge occurs through the solid line side of contact 12-1. This operation causes the contact 14- of the latching relay 14 to
1 and 14-2 are on the solid line side (second state).

In this manner, when a power outage occurs and the call is terminated from the power-on call state, the automatic power outage switching circuit 60 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 communication circuit 13 is [solid line side of contacts 14-1, 14-2 of latching relay 14 → diode 10 → power supply line 71 → relay 1
It is connected to the central office line through the path of solid line side of contacts 1-1 and 1-2 -> relay 7 -> diode bridges 3-6, 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. When power is applied from this state, the relay 1 does not operate, so its contacts 1-1 and 1-2 remain solid lines. Therefore, since no current flows to the automatic power failure switching circuit 60 due to the blocking by the diode 11, the contacts 14-1 and 14-2 of the latching relay 14 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 contact 14 of the latching relay 14 operates.
-1, 14-2 are on the dotted line side (first state),
Return to normal power mode.

FIG. 3 shows a configuration example in which the power failure automatic switching circuit 60 of FIG. 2 is partially modified. Here, 20, 21, 2
6 and 28 are resistors 22 and 23 are diodes, 24 is a constant voltage diode, and 25 and 27 are transistors. 20 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, and the resistor 21 is a resistor for preventing damage caused by rush current of the diode 18 and the transistor 27. The diode 22 protects the transistor 25, and the diode 23 protects the transistor 15 from reverse breakdown voltage. transistor 2
5 is for driving the S winding side of the latching relay 14, and a constant voltage diode 24 determines the operating voltage of the transistor 25. That is, when the power is turned on from a power outage state, the S winding of the latching relay 14 operates at a voltage higher than the operating voltage of the constant voltage diode 24. On the contrary, when the power is cut off from the energized state, the S winding of the latching relay 14 loses its holding force below the operating voltage of the voltage regulator diode 24. At the same time, the charge in the capacitor 19 is changed to [transistor 15 → P winding of latching relay 14 → transistor 27]
is discharged through the route of the latching relay 14.
is operated by the P winding. The transistor 27 is for rapidly discharging the voltage applied between ab and ab when the voltage applied during the power outage time ab drops gradually. That is, the charge in the capacitor 19 starts discharging, and the latching relay 1
When current begins to flow through the base and emitter of the transistor 27 to the P winding side of the transistor 26, the voltage between the base and emitter of the transistor 27 increases
The collector of transistor 27 rises due to
The emitters are made conductive, and the voltage between ab and ab is rapidly lowered through the resistor 21. In addition, one end of the resistor 28 that is not connected to the constant voltage diode 24 is connected to a
Alternatively, it may be connected to the connection point between 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 the call monitoring relay 12 in FIG.
The contact point 12-1 is replaced with interlocking switch switches 40-1 and 40-2. By using a 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 9], conduction occurs between the emitter and collector of the transistor 31, and the S winding of the latching relay 14 operates. When the capacitor 19 is charged, no current flows between the emitter and the base of the transistor 31, the emitter and collector of the transistor 31 become non-conductive, and no current flows through the S winding of the latching relay 14. In FIGS. 3 and 5, the diode 32 is used when the call monitoring is configured with a hook switch, when the central office line is not accommodated without the diode 32, and when the telephone goes off-hook during a power outage and is turned on again with the handset off the hook. This is to prevent the S winding of the latching relay 14 from not operating until it is 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. .

Furthermore, in FIGS. 2, 3, and 5, a capacitor controlled by the contact 12-1 or 40-2 is used as a means of accumulating energy for driving the latching relay 14, but it can also be easily realized using a battery. can.

As explained above, when switching from power on to power outage, and from power outage to power on, the telephone call circuit maintains the call or automatically switches the state depending on whether or not the call is in progress. This makes it possible to transmit 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 central device and a call changeover operation is performed, the present invention can be used to automatically change calls without having to manually change calls. It is possible to switch calls during a power outage, and it is possible to solve the problem of not being able to make a call due to an erroneous operation.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing an embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
Figures 3 and 5 are circuit diagrams showing specific examples of automatic power failure switching circuits used in the present invention, and Figures 4 and 6 are circuit diagrams showing partial modifications of the telephone used in the present invention. .

Claims (1)

[Claims] 1. One end of the telephone line is connected to the central office line via a telephone line switch within the main unit, and a pair of cables are provided separately from the telephone line, and when one end is energized, the line within the main unit is connected to the office line. In a telephone device that is connected to a DC power source and is 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, whether the telephone is in a call state or a non-call state 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 it is connected to the other end of the pair of cables; a latching relay having a latching relay having a latching relay; an energy storage means that stores energy during energization and discharges the stored energy when the monitoring means outputs an output indicating a non-talking state in the event of a power outage; When the means outputs an output indicating a non-talking state, the contact point of the latching relay is in the first state and the second state during power supply and power outage.
When the non-call mode is set and the monitoring means outputs an output indicating the call state, the contact point of the latching relay is activated at the time of transition from power outage to energization or from energization to power outage. By setting the call mode in which the second state or the first state is temporarily maintained, the call state is maintained and the energy stored in the energy storage means is released when the call state ends. and a drive circuit for controlling the contacts of the latching relay to return to the non-call mode when the latching relay is activated.