JPH0237754B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power outage countermeasure system in a key telephone device having a self-holding cross point switch for selecting the central office line of the key telephone device in the main device.

In order to prevent forced disconnection of calls due to power outages during calls and to ensure incoming and outgoing calls during power outages, countermeasures against power outages have been taken to ensure that calls made to central telephone lines using conventional button electrical equipment are uninterrupted using storage batteries and mechanical switches installed in button telephones are operated. was being carried out. However, these methods have drawbacks such as difficulty in reducing the size and cost of the device and poor operability.

The present invention solves the above-mentioned drawbacks, and uses a pair of communication lines and a pair of control lines connected between the main unit and the key telephone to continue the communication that has been going on since power was turned on in the event of a power outage. It is something that makes you New calls during a power outage are made using a specific button telephone set corresponding to the central office line, and the calls continue even when power is restored. Another object of the present invention is to provide an inexpensive power outage countermeasure system that is easy to operate and guarantees confidentiality of the central office line regardless of power on or power outage.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention. FIG. 2 is a circuit diagram showing one embodiment of the present invention. Identical parts in Figures 1 and 2 have the same symbols,
Indicated by number. The ME is a main device, and this main device accommodates a plurality of office lines, and FIGS. 1 and 2 illustrate only one of the office lines. In addition, a plurality of button telephones TEL ₁ to TEL _o each have a pair of communication lines L ₁
~L _o and a pair of control lines S ₁ ~ _{S o} are connected in parallel. REC is a diode bridge to match the polarity of the station line connected to the main device ME, L is a station line loop monitoring relay that monitors the usage status of the station line, T is a relay for power failure monitoring, and ^l1 is relay L. , t ³ is the contact of relay T, CONT is the button telephone TEL ₁ ~
This is a control circuit for controlling TEL _o via control lines S ₁ to _{S o} . XPSW ₁ to XPSW _o are crosspoint switches composed of PNPN switch ICs for telephone communication on the central office line, which are provided corresponding to the respective telephones TEL ₁ to TEL _o for each central office line. H is a relay for call control during a power outage using a two-winding self-holding relay, D ₁ , D ₂ ,
D ₃ is a diode, C ₁ is a capacitor for recovery operation of the H relay, R ₂ is a resistor, t ₁ and t ₂ are contacts of the T relay, and these elements operate the call control circuit during a power outage.
It constitutes TNC. SCR is a thyristor used as a switching element for calls during power outages, and ZD is a thyristor SCR set to a zener voltage lower than the open circuit voltage of the office line and higher than the voltage during calls on the office line.
Constant voltage diode for gate trigger control of R ₁
is the gate protection resistor of the thyristor SCR, VA is the varistor, and these elements constitute the power outage secret circuit TS. h ¹ and h ² are power outage communication path switches TSW made up of contacts of a relay H, and together with the aforementioned power outage privacy circuit TS, constitute a power outage communication path TP.

TEL ₁ is a special button telephone (hereinafter referred to as a power outage) that is installed corresponding to the office line shown in the drawing among the multiple office lines connected to the main device ME and can make and receive calls to that office line even in the event of a power outage. It is called a dual-purpose button telephone). TEL ₂ to _{TEL o} are general button telephones that cannot make new calls during a power outage. NW is a telephone communication circuit for making calls, TCONT is a telephone control circuit that corresponds to the main device ME via a control line, _D4 ,
_D5 is a diode, and HS is a switch contact.

In Figure 2, C ₂ is a DC current blocking capacitor on the office line, P is a pair of signal lines that connect the specific office line and the power outage button telephone in the event of a power outage, TT is a relay for monitoring power outage on the telephone side, and D ₆ is a diode, tt ¹ ,
tt ² is the contact point of the relay TT, and BEL is the bell.

First, the operation will be explained using FIG.

Since the office line loop shown in the figure is not closed when the handset of each button telephone is put down, that is, in the standby state, the office line loop monitoring relay L is in the restored state and the ^l1 contact is made. When the power is turned on at this time, the power failure monitoring relay T operates and is self-held at the self-contact ^t3 , so it continues to operate during the call. The control lines S ₁ to _{S o} supply power from the control circuit CONT of the main device ME to each of the button telephones TEL ₁ to _{TEL 2} , and also transmit and receive control information data to and from the telephone control circuit TCONT. Relay H for call control during power outage
The primary windings 1 and 2 are set coils, and the secondary windings 3 and 2 are set coils.
4 is a self-holding relay with a reset coil, and relay T continues to operate when the power is turned on. - Diode D ₂ - Relay H1 to 2 - t ² contacts -
Current flows through the set coil of relay H through the earth's air route and it becomes operational. Also for capacitor C ₁ - diode D ₁ - capacitor C ₁ - resistor R ₂ -
A charging current flows through the earth route, and the capacitor C ₁
is charged to the mains voltage.

First, in this power-on state, if you perform a capture operation from the power outage button telephone TEL ₁ to the office line corresponding to TEL ₁ , the office line capture information from the telephone control circuit TCONT of TEL ₁ will be controlled. line s ₁
The signal is transmitted to the control circuit CONT of the main device ME through the cross-point switch control circuit (not shown), and the cross-point switch XPSW ₁ made up of the PNPN switch IC is turned on and becomes conductive. Once the PNPN switch is turned on, it continues to hold it until the local line loop is disconnected.
Therefore, the illustrated office line is connected to the power outage key telephone TEL ₁ which has performed the office line capture operation, and continues to be in the office line communication state regardless of power supply or power outage.

Next, if a power outage occurs in this state, the power outage monitoring relay T of the main device ME is restored. Furthermore, even if the current in set coils 1 and 2 of relay H disappears, relay H continues to operate because it is a self-holding type relay.
Under the above conditions, the communication path switch TSW is activated during power outage.
Since the _h1 and _h2 contacts remain in operation, the communication path is not closed during a power outage on the central office line. Therefore, PNPN used as cross point switch XPSW ₁
Until the self-retention of the switch IC is terminated, that is, until the key telephone TEL ₁ , which also serves as a power outage, hangs up the handset, the central office line call can be continued through the crosspoint switch XPSW ₁ .

A button telephone that can also be used for power outages when the central line call is terminated.
When the handset of TEL ₁ goes down, crosspoint switch XPSW ₁ opens and the crosspoint switch HS returns to the recovery state. Therefore, capacitor C ₁ is: capacitor C ₁ - relay H3-4-t ² contacts - control line S ₁ - hook switch HS - diode D ₄ - control line S ₁ - ^{t 1} contact - diode D ₃ - capacitor C ₁
The relay H is restored by the discharge current of _C1 flowing through the reset coil.

During a power outage, when the handset of the power outage key telephone TEL ₁ is raised to make a call to the office line shown in the diagram, the ^h1 and ^h2 contacts, which are the power outage call path switch TSW, have been restored, so this is the secret behind the power outage. The constant voltage diode ZD of the circuit TS becomes conductive when the local line voltage is applied.
Therefore, a current flows through the gate of the thyristor SCR and the thyristor SCR becomes conductive, so that the stop/stop button telephone TEL ₁ enters a talking state through the office line and the power outage communication path TP. At this time, even if power is to be retransmitted, the relay L for monitoring the station line loop is in the operating state, so the relay T cannot operate. Therefore, since the relay H for controlling calls during a power outage continues in the restored state, the call from the time of the power outage via the power outage call path TP continues until the call is terminated.

Note that when the telephone call from the time of the power outage ends and the handset is put down, the office line loop is disconnected and the office line loop monitoring relay L is restored. Therefore, relay T and relay H
operates in the same manner as when the power is turned on as described above, and returns to the energized state.

In addition, when the power is on, the power outage key telephone TEL ₁ is connected to a central office line (not shown in Figure 1)
If a power outage occurs while you are making a call by activating the crosspoint switch corresponding to the central office line (not shown in the diagram), you may also Just as in the case of a power outage during a call with a telephone, the relay H for controlling calls during a power outage will not be restored until the call ends and the handset is put down. Therefore, it is a button telephone that can also be used for power outages.
The illustrated central office line corresponding to TEL ₁ is a power outage communication path switch TSW (h ¹ and h ² contacts) that are in operation, so the communication path TP is not closed during a power outage. There will be no collision with other central lines.

Second, we will explain how to make a call from a general key telephone TEL ₂ . When power is on, if you perform a capture operation on the central office line shown in the figure from a general key telephone TEL ₂ while the power outage switch telephone TEL ₁ has its handset lowered, office line capture information will be sent from the telephone control circuit TCONT of TEL ₂ . is transmitted to the control circuit CONT of the main device ME through the control line _S2 . A crosspoint switch configured with a PNPN switch IC using a crosspoint switch control circuit (not shown)
XPSW ₂ is ignited and becomes conductive, and button telephone TEL ₂ captures the central office line shown in the figure and continues to talk regardless of power on or power outage.

If a power failure occurs here, the power failure monitoring relay T of the main device ME is restored, and the current in the set coils 1 and 2 of the communication control relay H in the event of a power failure also disappears. on the other hand
Since the t ¹ and t ² contacts return to the state shown in the figure, the capacitor C ₁
is capacitor C ₁ -H relay 3~4-t ² contacts - control line S ₁ - hook switch HS - diode D ₄ - control line S ₁ -t ¹ contact - diode D ₃ - capacitor C ₁
The relay H is restored by the discharge current of the capacitor _C1 flowing to the reset coil. Therefore, in the event of a power outage, the h ¹ and h ² contacts, which are the communication path switch TSW, return to the state shown in the figure, so the office lines shown corresponding to the stop button telephone TEL ₁ are h ₁ and h _2.
As a result, the communication path will be closed during a power outage.

In this state, even if there is a power outage, the button telephone
While TEL ₂ continues to be in the talking state, when the power outage/pocket telephone TEL ₁ raises its receiver to make a call to the central office line, the voltage of the central office line is applied to the constant voltage diode ZD of the secret communication circuit TS during a power outage. However, the line voltage of this central office line has been lowered by telephone TEL ₂ , which has previously captured the central office line, and is now lower than the Zener voltage value of the constant voltage diode ZD. Therefore, the constant voltage diode ZD cannot conduct electricity, and the gate current of the thyristor SCR does not flow, so it remains non-conductive. Therefore, even if the power outage key telephone TE ₁ lifts up its handset, it is unable to capture the office line and becomes in a confidential state.
Next, the key telephone that captured the central office line first
TEL ₂ ends and cross point switch XPW ₂
After opening, the station line voltage changes to the Zener diode.
When applied to ZD, the thyristor SCR becomes conductive and can capture the central line.

In addition, in Figure 1, the station line loop monitoring relay L
It _is possible to control the power failure monitoring relay T by replacing the
XPSW _o is used as a self-holding relay contact, and thyristor SCR of the power outage secret circuit TS is used as a relay contact.
It goes without saying that a replaced circuit configuration is possible.

Thirdly, ringtone ringing during power outage will be explained. In FIG. 2, when the power is turned on while each button telephone is in the standby state, the power failure monitoring relay T is activated because the loop of the central office line shown in the figure is not closed. Relay for power outage monitoring on the telephone side of TEL ₁ button telephone for power outages
Current flows through the route of the control circuit CONT's -t ¹ contact - control line S ₁ - diode D ₆ - relay TT - control line S ₁ - t ₂ contact - to operate the relay TT and also connects the telephone through diode D ₅ . control circuit
Supply power to TCONT. At this time the button telephone
Fixture switch HS at TEL ₁ is closed, but
Current from the main device is blocked by diode _D4 . If a power outage occurs in this state, the main device's power outage monitoring relay T and the telephone side's power outage monitoring relay
TT is restored, and the recovery operation capacitor C ₁ of relay H for controlling communication during power outage of the main device is capacitor C ₁ - relay 3-4-t ² contact - control line S ₁ - hook switch HS - diode D ₄ - control line Since the relay H is discharged along the route _S1 - ^t1 contact-diode _D3 -capacitor _C1 , the relay H is restored by the discharge current of the capacitor _C1 flowing through the reset coil. The discharge current of the capacitor C ₁ is the diode D ₆
Since it is blocked by the power supply and does not flow to relay TT, it does not affect the recovery operation of relay H.

In the event of a power outage, relay T and relay TT are both restored, so station line terminal L ₁ -t ⁴ contacts - signal line P - tt' contact - bell
BEL-tt ² contacts - signal line P-t ₅ contacts - capacitor
An incoming call signal from the office line is applied to bell B on the route of _C2 -office line terminal _L2 , and the office line ring tone sounds.

As explained above, according to the present invention, a pair of communication lines and a pair of control lines are used to connect the main device and the key telephone, and when power is applied, a cross point switch corresponding to each key telephone is used. During a call, the call can be continued even during a power outage. In the event of a power outage, the usage status of the power outage button telephone is transmitted via the control line to the power outage call control circuit of the main unit, and this circuit controls the power outage call path switch to allow calls during a power outage, allowing communication between central office lines. to prevent conflicts between In addition, the present invention provides a convenient and easy-to-operate power outage countermeasure system that guarantees confidentiality and furthermore provides an audible display of the incoming call on a power outage button telephone set when a central office line call is received during a power outage using a pair of separately prepared signal lines. It is.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram as an embodiment showing a power outage countermeasure method in a key telephone device according to the present invention. FIG. 2 is a circuit diagram as an embodiment of the power outage countermeasure method according to the present invention. ME...Main device, TEL ₁ ...Button telephone for power outage, TEL ₂ ~ TEL _o ...Button telephone, CONT
...Control circuit, XPSW ₁ to XPSW _o ...Crosspoint switch, TCONT ...Telephone control circuit,
NW……Speech circuit, L ₁ ~L _o …Speech line, S ₁ ~ _{S o} …
...control line, P...signal line.

Claims (1)

[Scope of Claims] 1. Consists of a main device equipped with a cross-point switch having a self-holding function for selecting a central office line, and key telephones that are individually connected via the cross-point switch. At least, in a button telephone device that is connected by a pair of talking lines and a pair of control lines and is configured to connect a specific office line and a specific button telephone in the event of a power outage, a crosspoint switch corresponding to the specific key telephone A power outage communication line connected in parallel with the power outage, a loop monitoring element inserted into the office line, and a loop monitoring element inserted in the central office line, and in series with its own winding.
A power failure monitoring relay into which a contact of its own is inserted that is closed when energized, a drive contact of a loop monitoring element that is connected in parallel with the contact of the power failure monitoring relay and which is open during station line capture, and a drive contact of a loop monitoring element that is connected in parallel with the contact that is closed when energized; It operates by the current flowing to the primary winding through the charged first capacitor and the contacts of the relay for power failure monitoring during energization operation, and after a power failure occurs, the discharging current of the capacitor flows through the secondary winding and the power outage. A two-winding relay for call control during a power outage, which has a self-holding function that restores when the power flows through the restoration contacts of the monitoring relay, the control line, and the switch contacts of a specific button telephone set in standby mode; When the relay for communication control during a power outage inserted in series in the communication path is restored, the contact and thyristor are connected, and the voltage of the specific station line for activating the thyristor connected in parallel with this thyristor is conductive at the voltage when the relay is not captured. A voltage diode is installed, so that when a power outage occurs and when the power outage is restored, the button telephone continues to capture the central office line while the telephone is in a talking state,
In a button telephone device, after a power outage occurs, a specific central office line on which a call that has been ongoing since before the power outage has been terminated is connected to a corresponding specific key telephone device via the power outage call path. Power outage countermeasure method. 2 Consisting of a main unit equipped with a cross-point switch with a self-holding function for selecting a central office line, and a button telephone set that is individually connected via the cross-point switch, at least one pair of communication lines is connected between the main unit and each button telephone set. In a button telephone device that is connected by a pair of control lines and configured to connect a specific office line and a specific telephone in the event of a power outage, a power outage is connected in parallel with a crosspoint switch corresponding to a specific key telephone. a loop monitoring element inserted into the office line; a power failure monitoring relay having its own contacts inserted in series with its own windings to be in contact during energized operation; and the contacts of the power failure monitoring relay. The driving contact of the loop monitoring element, which is connected in parallel with
It operates when current flows to the primary winding through the capacitor and the contact point of the relay for power failure monitoring, and after a power failure occurs, the discharge current of the capacitor decreases to 2.
A two-winding wire that has a self-holding function that restores when the power flows through the next winding, the power failure monitoring relay's recovery contact, the control line, and the switch contact of a specific button telephone that is in standby mode. When the control relay and the relay for controlling communication during a power outage inserted in series in the communication path are restored, the contacts and thyristor that are connected, and the specific station line for activating the thyristor connected in parallel with this thyristor are not captured. A constant voltage diode that conducts with voltage is installed, and when a power outage occurs and when the power outage is restored, the button telephone continues to capture the central office line while the telephone is in the talking state. The key telephone device is such that a specific central office line on which a call has been terminated is connected to a corresponding specific key telephone via the power outage communication path, and the button telephone is connected between the control lines in the specific key telephone A rectifier is connected in series with the telephone side power failure monitoring relay TT so that the polarity is opposite to the polarity of the discharge current of the first capacitor that flows when detecting the restoration of the handset. When the monitoring relay is in operation, it is operated by supplying current through the control line, and the specific button telephone and the main device are connected with a pair of signal lines,
An incoming call indicator is connected between the signal lines in the specific button telephone through a contact that comes into contact when the power failure monitoring relay TT on the telephone side is restored, and within the main device, the signal line is connected to a second When the capacitor and power failure monitoring relay are restored, they are connected to the office line through the contacts of the power failure monitoring relay, and the bell signal transmitted from the office line during the power outage is displayed on the incoming call display via the signal line. A power outage countermeasure method for a button telephone device characterized by the following: