JPS6242697A - Key telephone set - Google Patents

Abstract

PURPOSE:To maintain that a handset is picked up until it is put back only in power failure by storing information on power failure, power restoration or turning ON a power source in a memory and utilizing said information. CONSTITUTION:A power failure monitoring circuit 20 detects the power failure when it occurs and informs an NPU 10. The NPU 10 receives and stores the information in the memory 21. Afterwards, a key telephone system is completely in power failure, and stops its action to switch the contact 2 of a power failure relay 1 to a side A. When information that the handset is picked up is transmitted, the NPU 10 investigates the information stored in the memory 21, and remains the contact 2 of the relay 1 at the side A if the information on power failure is present. When the NPU 10 obtains information that the handset is put back according to the state of a hook switch 15 and attains its original state, the NPU 10 controls the power failure relay 1, and switches the connection 2 to a side B.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a button telephone device that automatically switches an outside line to be directly connected to the talking circuit of the key telephone during a power outage.

BACKGROUND OF THE INVENTION FIG. 3 shows the structure of a conventional key telephone device of this type. In Fig. 3, 1 is a power outage switching relay for switching communication paths in the event of a power outage, 2 is a contact of the power outage switching relay 1, and 4 is used to form a communication path or dial when operating as a button telephone device. 5 is a contact point of this dial relay 4, 6 is an analog switch that forms a communication path when operating as a button telephone device, and 7 is a telephone line for supplying power for telephone calls to the button telephone device. 8 is a control power supply circuit that supplies control power to the button telephone, 9 is a data communication interface circuit for data communication with the button telephone, and 10 is a microcontroller that controls the operation of the entire button telephone. Processor (hereinafter referred to as NPU), 11 is a capacitor that cuts direct current, 12 is an audio line from 2 to 4
13 is a handset, 14 is a hook switch for forming a communication line,
15 is a flag used as a control signal for the button telephone device.

16 is a data communication interface circuit for data communication with the NPU, 17 is a power supply circuit for converting the power sent from the main unit to 5V, 18 is a key for dialing, and 19 is a button telephone. It is a controlling microprocessor (hereinafter referred to as APU).

Next, the operation of the above conventional example will be explained. In FIG. 3, during a power outage, the contact 2 of the power outage relay 1 is closed to the A side, and calls can be made even in this state. When the power is restored during a call, the APU 19 checks the status of the hook switch 15 and
It detects that the handset is up and notifies the NPU 10 through the data communication interface circuit 16.9. When the NPU 10 receives information that the handset 13 is up, it does not operate the power outage switching relay 1, but operates it only when the call ends, and switches its contact to the 13 side. Therefore, in this state, it is possible to operate as a key telephone device. Further, if the information sent is that the handset is not up, the NPUIO immediately operates the power outage switching relay 1 and switches its contact 2 to the B side, making it possible to operate as a button telephone device.

Problems to be Solved by the Invention However, with the above-mentioned conventional key telephone device, it is impossible to distinguish between a call during a power outage and whether the handset of the key telephone was disconnected when the power was turned on. Sometimes, if the handset of a key telephone is removed, the outside line becomes the outside line of the button telephone and cannot be used until the handset of the button telephone is put back in place.

The present invention solves these conventional problems,
To provide an excellent key telephone device that maintains the same state until the handset is put down when the handset is raised only during a power outage.

Means for Solving the Problems In order to achieve the above object, the present invention provides a power failure monitoring circuit;
There is a memory that stores information in case the power is cut off due to a power outage, a battery that prevents the information from disappearing even during a power outage, and a memory that determines the status of the handset when the power is turned on. A means for controlling a power outage switching relay is provided between the stored information, and by this means, when the power is cut off due to a power outage and the power is restored, the power outage switching relay is maintained as it is until the handset is returned to its original state, The switching control is performed only when the power is restored, and the power failure switching relay is immediately switched when the power is simply turned on.

Therefore, according to the present invention, when the power goes out due to a power outage and is restored by 1 level and then the power is turned on, depending on the state of the handset, if the phone was in the state of being on the phone during the power outage, You can continue talking as is, and if you simply turn on the power during installation work, you can immediately use it as the outside line of the key telephone device even if the handset is disconnected, and the outside line is not wasted. It has the effect that there is no need to put it away.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, 1.2 and 4 to 19 are all the same as shown in FIG. 20 is a power outage monitoring circuit, 21 is a memory for remembering that a power outage is occurring, and 22 is a backup battery to prevent the contents stored in the memory 21 from being erased even during a power outage.

Next, the operation of the above embodiment will be explained. In the above embodiment, when a power outage occurs, the power outage monitoring circuit 20 senses it as soon as possible and notifies the NPU 10 of it.

The NPUIO receives the information and stores the power outage information in the memory 21. After that, the button telephone device is completely cut off and stops operating, and contact 2 of power outage relay 1 becomes A.
Switch to the side. When the power is restored while the key telephone is talking to an outside line during a power outage, the APU 19 checks the status of the hook switch 15 and sends Kokichi, whose handset is up, to the NPUIO through the data communication interface circuits 16 and 9. to be transmitted. When NPU IQ receives information that the handset is up, it checks the information stored in memory 2I, and if there is information that there is a power outage, it switches on power outage switching relay 1.
Leave contact 2 on the A side. When information is received indicating that the handset has been lowered and returned to its original position due to the state of the hook switch 15, the power failure relay 1 is controlled and its contact 2 is switched to the B side.

The information in the memory 21 is cleared when the power failure relay contact 2 of each outside line becomes the B side.

Incidentally, FIG. 2 is a flow chart diagram showing these operations.

In this way, according to the above embodiment, when the power is turned on? ζ Since there is information on whether the handset is up and whether the power is restored during a power outage or simply turned on, you can immediately make calls without disconnecting during a power outage, and only when the handset falls off after installation work. The outside line can be used as the outside line of the key telephone device.

In the above embodiment, a power outage monitoring circuit is provided and a power outage signal is used. However, in the event of a power outage, a button telephone device normally continues to operate using the built-in battery for a certain period of time. In this case, the system detects when the voltage of the battery drops below a predetermined value, and
It can also be used in place of power outage information.

Effects of the Invention As is clear from the above embodiments, the present invention stores information on whether the power is restored during a power outage or is simply turned on in a memory and uses this information, so that it is possible to make calls during a power outage. It has the advantage that it can be used efficiently as an outside line of the key telephone device immediately without having to disconnect the telephone line, and if the handset is removed during installation work or the like.

[Brief explanation of drawings]

Fig. 1 is a schematic block diagram of a button telephone device according to an embodiment of the present invention, Fig. 2 is a flowchart showing the operation of the embodiment described in -F, and Fig. 3 is a schematic diagram of a conventional key telephone device. It is. ■...Power outage switching relay, 2...Power outage switching relay contact,
4...Dial relay, S...Dial relay contact, 6...Analog switch, 7...Telephone power supply circuit, 8...Control power supply circuit, 9...Data communication interface circuit, 10.・Microprocessor-1
11... Capacitor, 12... Hybrid circuit,
13... handset, 14... Fuchs inch, 15.
... hook switch, 16... data communication interface circuit, 17... power supply circuit, 18... key,
19...Microprocessor-120...Power failure monitoring circuit, 21...Memory, 22...Battery. Name of agent: Patent attorney Toshio Nakao
to Figure 2 C-') ν

Claims (1)

[Claims] A power outage monitoring circuit, a memory for remembering that a power outage is occurring based on the output of this power outage monitoring circuit, and a backup battery for retaining power outage information stored in this memory even during a power outage. It has a control means that determines the state of the hook switch when power is supplied, and controls a power outage switching relay based on the information stored in the memory, and when the power is restored by this control means. The power outage switching relay is left in that state until the handset is lowered and hooked on, and only when the handset is hooked on is it switched from the power outage side to the side that functions as a button telephone device, and when the power is simply turned on. is a button telephone device configured such that a power outage switching relay is immediately switched from the power outage side to the side functioning as a button telephone device, regardless of whether it is on-hook or off-hook.