JPS61240797A - Telephone set circuit in key telephone set for power failure - Google Patents

Abstract

PURPOSE:To eliminate the need for controlling means of dial sending circuits and to improve the function of a key telephone set by changing respective calling loops in service and power failure times through a relay contact for monitoring the power failure and by connecting incoming information circuits with calling lines in the power failure time. CONSTITUTION:The make-contact pfs<1> of a monitoring power failure relay PFS in the service as well as calling loops in the service time through a diode bridge DB31 and calling circuit 32 are prepared and the break-contact of pfs<1> in the power failure time as well as calling loops through DB33, Q1, D1 and a circuit 32 in the power failure time are also prepared. Furthermore, the incoming information circuit 38 in the power failure time is connected with the calling line 11 and when the make-contacts of HS<1> and HS<2> inserting in the respective calling lines 11 are ON, the respective calling loops are closed. In addition, incoming signals in the power failure time are informed by the circuit 38 and a speaker SP and then a loop electric current in the power failure time flows to a dial circuit 35 and makes possible a dial sending according to an off-hook.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power outage telephone circuit for a button telephone device that uses a commercial power source as a main power source and is equipped with a power outage countermeasure function.

[Conventional technology]

Key telephone devices generally use commercial power as their main power supply, and as a countermeasure against power outages, the button telephone for power outages is housed in a specific location, and switching is performed manually or automatically, so that the telephone line can be directly cut off in the event of a power outage. It connects to a private button telephone and allows you to make and receive calls directly to the telephone line.

In addition to the normal standard configuration, the power outage button telephone is equipped with a dial dial circuit, a tone ringer for power outages, a power outage monitoring relay, etc., and the power outage monitoring relay is activated when the power supplied from the main unit is cut off. After restoration, activate the dialing circuit, connect the power outage tone ringer to the call line, disconnect the receiving loudspeaker circuit from the call line, and connect the power outage tone ringer to the power outage tone ringer from each circuit used while power is being applied to the loudspeaker for receiving loudspeakers and sending out various signal tones. It is designed to switch from the energized operation mode to the power outage operation mode by performing switching connections, etc.

[Problem that the invention seeks to solve]

However, in the past, separate power failure monitoring relay contacts were used to connect the power outage tone ringer to the communication line and to switch the speaker input during a power outage.
In order to activate the dialing circuit, a separate contact is used, and a total of three sets of relay contacts are required, and an inexpensive relay with two sets of contacts cannot be used as a power failure monitoring relay, and this is expensive. This is causing a problem.

Furthermore, even if contacts are not used to activate the dialing circuit, since the circuit uses the loop current from the telephone line as its power source, it is necessary to prevent contact with the local power supply inside the telephone, and photocouplers etc. Insulation intermediary control means are used, which similarly poses the problem of being expensive.

[Means for solving problems]

In order to solve the above-mentioned problem, the present invention is constructed by the following means.

That is, in the above-mentioned power outage button telephone, it operates according to the power supply and prepares for a call loop when the power is on, and when the power supply is cut off, it is restored and prepares for the call loop during a power outage, and it also operates when the power supply is interrupted. The contacts of the power failure monitoring relay that connects the alarm circuit to the communication line, the make contacts of the hook switches inserted individually into the energized call loop and the power outage call loop, and between the energized call loop and the power outage call loop. It is a round device that includes a diode inserted in the forward direction for the loop current flowing to the power outage call loop, and a dial circuit connected in parallel to the diode on the power outage call loop side.

[Effect]

Therefore, the contacts of the power outage monitoring relay switch the call loops between energized and power outage, and in the event of a power outage, the incoming call alarm circuit for power outage is connected to the call line, while each individual meter contact of the hook switch Each call loop is then closed.

In addition, the diode prevents loop current from flowing into the call loop when the power is on, and in the event of a power outage, the dial circuit operates due to the loop current from the telephone line. It's okay to connect to Naru.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

The figure is a block diagram of a power outage key telephone (hereinafter referred to as ST), and 6D is the main unit (hereinafter referred to as KSU
) are connected to each other by one pair of telephone lines 11 and one pair of signal lines 21, and the telephone lines 11 and 8U are exchanged and connected, and the telephone line from the central office line or private branch exchange is connected by manual or automatic switching on the KSU side. While the KSU is directly connected to a telephone line such as the KSU, power is supplied from the KSU via the signal line 21, and data signals are transmitted and received.

In this case, the direct side of the communication line 11 is connected to the communication circuit (hereinafter referred to as TKO) 32 via the contact pfs' of the power failure monitoring relay PFS and a diode bridge (hereinafter referred to as DB) 31.
It is connected to another similar line L! The side is connected to TKC32 via hook switch Ha' and DB31, and DB33 is connected via hook switch Ha to the break pole of contact pfs' and the main pole of hook switch H8'. A dial pulse sending transistor Q1 and a diode D1 are inserted between the positive electrode of DB31 and the positive electrode of DB31.

By Zeon, it has become a book that is controlled off.

In addition, the negative terminals of DB31.33 are commonly connected, and DB33
A constant current circuit (hereinafter referred to as
CIC) 34, dial circuit (hereinafter referred to as DIC) 3
5 is connected, this is a dial key (hereinafter referred to as DK')
36, controls the bias of the transistor Q1 by the resistor RI0 through the transistor Q,
This is used to turn off and on, and send out dial pulses.

Note that there is a resistor RI! between the two lines RI, L, and the contact pfs'. and capacitor CI and DB3T
A tone ringer (hereinafter referred to as TRG) 38 for power outage is bridge-connected through υ, and its output is given to the speaker sp via the transformer Ts and the contact pf-.
Between the one line L1 and the other line via the contact pfs' and the hook switch H8I, there is a resistor Lx and a capacitor/
A transformer Tv for audio component extraction is bridge-connected via C12, and its output is connected to an analog switch (hereinafter referred to as
ASW) and an amplifier (hereinafter referred to as PA) 40 to the speaker SP.

On the other hand, a power supply circuit (hereinafter referred to as PS) 41 and a transmission circuit (hereinafter referred to as TR) 42 are connected to the signal line 21, and the KSU
PS41 stabilizes the power supplied from the local power supply V
A control unit (hereinafter referred to as CNT) 43 consisting of L, microprocessor, memory, etc. transmits and receives data signals via the TR 42.
Hook switch H8a on due to off-hook, DK3
A DK that is the same as B but uses the other of the double contacts, and a Kiniboard (hereinafter referred to as
In response to the output of KB)44, the operation data indicating these conditions is transmitted, while the display unit (hereinafter referred to as DP) consisting of a group of indicator lights is transmitted in accordance with the control data received from the KSU.
45. Tone generator (hereinafter referred to as T) that generates various signal tones
SG) 46, ASW47 which gives its output to PA40
, and controls the ASW 49, PA 40, etc.

In addition, a power failure monitoring relay PFS is connected to the output of PS41, operates according to the power supply from KSU, and contacts p
The energizing operation mode is set with "fs', pfs" in the operating state, but it will recover when the power supply is interrupted and the contact p
Connect both υ lines L1 and L to DB33 according to fs' and TK
The loop current from the telephone line is passed to C32 and DIC35 via transistor Q1, diode D, or CIC34, and contact pf- switches the input of speaker SP to TRG3B to set the power failure operation mode. ing.

In addition, initial reset circuit (IR8) 50
is provided, and when the power supply starts, the lR85G resets the CNT 43 in response to this and starts operation.

Therefore, while power is being supplied, the operation data corresponding to the off-hook and KB44 operations 2>ECNT
43Kj is transmitted to KsU via TR42, and KSU performs dialing and exchange connection according to this, and in response to control data from KSU, CNT4
3 controls each part, display by DP45, ASW39,
On-hook monitor controlled by PA4G, ASW47
．． Various signal tones are sent out under the control of TSG46, and as the hook switch H8' operates, TRG
A telephone call is made using the telephone number 32.

On the other hand, if the power supply is cut off, the relay PFS is restored and enters the power outage operation mode, and the CNT43 stops operating and does not transmit or receive data signals, and the DP
The display by TSG 45 will also stop, and the transmission of signal tones by TSG 46 will also become impossible. However, if the telephone line 11 is connected directly to the telephone line manually or automatically at the KSU,
The incoming call is announced by RG3B and speaker SP, and T
A call is made using KC32.

In addition, when off-hook is performed, the loop current from the telephone circuit activates the DIC 35, a dial call is made in response to the operation of the DK 36, and when the other party responds, the DIC 35 is activated.
You can freely make calls using TKC32.

That is, when the power is on, the make pole of the contact pfa' is turned on, and preparations are made for a call loop when the power is on by 9, DB31, and TKC32, whereas during a power outage, the make pole of the contact pfa'
The break pole of fs' is turned on, and DB33, Tranref 291% diode D, and TKC32 prepare for a call loop in the event of a power outage, and TRG38, which serves as an incoming call notification circuit for power outage, is connected to the call line 11. Therefore, hook switches H8' each inserted into the communication line 11 side from DB31 and 33 of each communication loop,
If the make contact of H8” turns on due to off-hook,
Each call loop is closed individually, so that calls can be made freely in any state, and incoming calls during a power outage are notified by the TRG 38 and speaker SP.

In addition, a diode D is inserted between the two call loops, with the loop current passing through the call loop during a power outage in the forward direction, and a CIC 35 is connected in parallel to the side of the call loop during a power outage. When the loop current is diode D
, and the CIC 35 becomes inactive, but the loop current at the time of power outage passes through the CIC 34 to the CIC 35 and is activated, so dialing can be made freely in response to off-hook.

If the KSU side is equipped with a battery power supply for power outage backup, the power supply will be interrupted after the backup time corresponding to the capacity of this power supply has elapsed. However, the operating status of the STI is the same in either case.

Therefore, the power failure monitoring relay pFs has two sets of contacts p.
It is sufficient to use a device having only "fa' and pfs", which is inexpensive and does not require the use of a photocoupler or the like.

Note that hook switches generally have transfer contact 1.
It is not particularly expensive as it includes a pair of contacts and two sets of make contacts.

However, other display or sounding means may be used in place of the TRG38 and the speaker sP, and depending on the configuration of the CIC35, the CIC34 may be omitted. , MP) signal as a dial signal, various modifications are possible, such as using a DIC that generates an MF signal.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, an inexpensive relay can be used as a power outage monitoring relay, and a control means for the dialing circuit is no longer required, and it has a remarkable effect as a power outage telephone circuit in various button telephone devices. is obtained.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of the present invention. 1...BT (key telephone), 11.φ...talking line, 31.33.3T...DB (diode bridge), 32...TKC (talking circuit), 35...
DIC (dial circuit), 36...-DK (dial key), 3aφ・Fist・TRG ()-Nringa), H8
',H8''・-・Fist Fukusuit 'F'',D+・-
...Diode, PF511...Power failure monitoring relay, p
fs, pfa...Contact.

Claims (1)

[Claims] When the power supply from the main device is cut off, the dial circuit and the incoming call notification circuit for power outage are activated, and the power supply is supplied to the power outage button telephone of the button telephone device, which activates the dial circuit and the incoming call notification circuit for power outage, and makes it possible to make and receive calls directly to the telephone line in the event of a power outage. contacts of a power outage monitoring relay that operates in response to power supply to prepare a call loop when the power is turned on, and restores and prepares a call loop in the event of a power outage when the power supply is cut off, and connects the power outage incoming call notification circuit to the call line; and between the make contact of the hook switch inserted into the energized call loop and the power outage call loop, and the energized call loop and the power outage call loop, for the loop current flowing to the power outage call loop. 1. A power outage telephone circuit for a button telephone device, comprising: a diode inserted as a forward direction; and a dial circuit connected in parallel to the power outage call loop side of the diode.