KR100195434B1 - Keyphone system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key phone system, and more particularly, to a key phone system in which a key phone itself can be used as a general electric vehicle without the need for attaching a general phone to the main device.

In the conventional key phone system, the key phone cannot be used when there is no battery at the time of power failure, and even if the battery is not available for a long time, there is an inconvenience in that a general telephone is provided separately from the main device side.

In the key phone system of the present invention, when a power failure occurs, the voice line flowing into the key phone is connected to the trunk line, the power supplied from the trunk line is changed to a predetermined DC voltage, and is supplied to each circuit unit in the key phone, and the ring signal is received through the trunk line. Detects and recognizes the CPU, and sets the path for transmission and reception, so that the CO line can be made even in the exhibition, eliminating the inconvenience of having to have a separate phone in the key phone system.

Description

Key Phone System

1 (a) to (b) are internal configuration diagrams of a main device and a key phone of a conventional key phone system.

2 (a) to 2 (b) are block diagrams illustrating a main device and a key phone block in the key phone system according to the present invention.

3 is a key circuit diagram according to the present invention.

* Explanation of symbols for main parts of the drawings

2, 12: DC power conversion unit 4: CPU

6: analog switch unit 13: trunk line interface unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key phone system, and more particularly, to a key phone system in which the key phone itself can be used as a general telephone without the need for attaching a general telephone to the main device separately.

1 shows a conventional key phone system configuration, in which reference numeral (a) indicates a claim value, and (b) shows an internal configuration of a key phone. In the main device of FIG. 1 (a), normally, the external trunk lines T and R and the trunk line interface unit 1 are connected, and during a power outage, the relay between the trunk line interface unit 1 and the external trunk lines T and R (RLI, RL2) is operated so that the external main lines (T, R) are connected to the general telephone side separately provided outside the main apparatus.

The key phone shown in Fig. 1 (b) has a DC power supply converting section 2 for converting a supply power supply to a desired DC voltage, and data transmission / reception for communication of transmission / reception data via data lines L1 and L2. The receiver 3, the CPU 4 performing the control operation, and the analog switch unit 6 for connecting a path to the transceiver 8 and the speaker or microphone side 9 in accordance with the control command of the CPU 4 ), A tone / voice generator 7 for generating a predetermined tone signal and a voice signal according to the command of the CPU 4, an LCD and a key detector 5 for detecting a dimming display button and key input of the key phone; And transformers T1 and T2.

In the conventional key phone B shown in FIG. 1, the two lines L1 and L2 for data supply, the power supply Vcc and the two lines L3 and L4 for voice transmission are supplied from the keyphone main device A. FIG. The power supply voltage Vcc supplied to the transformer T1 on the data supply lines L1 and L2 is converted into a predetermined direct current voltage through the DC power supply conversion section 2 and supplied to each circuit section. At the same time, data from the main device A is received by the data transmission / reception section 3 via the trunk line interface section 1 and input to the CPU 4, and data from the CPU 4 is received by the data transmission / reception section. (3) is transmitted to the main apparatus (A). The two lines L3 and L4 for audio transmission are routed to the transmitter / receiver 8 or the speaker and microphone 9 through the analog switch unit 6 under the control of the CPU 4. Also, when the keyphone receiver receives the information that the keyphone is being called from the main device, the CPU 4 of the keyphone B controls the tone / voice generator 7 and generates a ring signal.

In the conventional key-phone system, when the battery is out of power failure, the key-phone cannot be used, and even if the battery is not available for a long time, there is an inconvenience in that a general telephone is provided separately from the main device side.

The present invention has been made to solve this problem, by interfacing the external main line connected to the main device side in the key phone system to the voice line of the key phone, when the power line is connected to the trunk line interface inside the key phone itself to the key phone itself during power outage The purpose is to provide a key phone system that can be called normally.

In order to achieve the above object, the present invention provides a key phone system comprising: a relay for performing a switching operation for connecting an external trunk line with a trunk line interface unit during normal operation and an external trunk line with a voice line of the key phone during power failure; With; The switch is connected to the voice line and operated by manual operation to switch the connection of the voice line in case of power failure, and is connected to the voice line through the switch, and is connected to the voice line through the voice line and the switch. DC power converter converts the applied power into a predetermined DC voltage and supplies the operating power, and detects the ring signal received from the external main line via the voice line to notify the CPU through the analog switch unit and turns on / off the handset. And a trunk line interface unit for notifying off-hook to the CPU through the analog switch unit.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

2 is a block diagram showing a schematic internal configuration of the main device A and the key phone B of the key phone system according to the present invention.

In FIG. 2 (a), the external trunk lines T and R are normally connected to the trunk line interface 11, and when the relays RL3 and RL4 are praised due to a power failure, the external trunk lines T and R are voice lines. It is directly connected to the key phone B through (L3, L4).

In FIG. 2 (b), when the power outage occurs and the external station lines T and R are directly connected to the keyphone by the relays RL3 and RL4, two voice lines of four lines flowing into the existing keyphone are introduced. Only (L3, L4) is used as the transmission path. In the key circuit, a manually operated switch (SW) connected to the voice lines (L3, L4) is provided. The DC power supply is connected through the contact point of the switch (SW). The converter 12 and the trunk line interface 13 are connected to the voice lines L3 and L4.

FIG. 3 is a circuit diagram showing the internal structure of the key of FIG. 2 (b), and '14' is a detailed circuit diagram of a portion in which a vertical is added to an existing key phone. The switch SW is connected to the voice line L3 to connect the trunk lines T and R to the DC power converter 12 and the CO line interface 13 during power failure, and the DC power converter 12 The power supplied from the trunk lines T and R is converted into a predetermined DC voltage and supplied to each circuit in the key phone. In addition, the trunk line interface unit 13 includes a bridge diode BD for maintaining a constant power supply at both ends of the voice lines L3 and L4, a hook switch H / S connected to the bridge diode, and a hook switch H /. A photocoupler ISO is connected to the contact ac of S) to detect the ring signals received through the voice lines L3 and L4 and inform the CPU 4 of the ring signals.

In the power failure in FIG. 2, since the power supply is stopped in the main device A, the power supply to the trunk line interface unit 11 is stopped, and the supply power and data transmission to the data lines L1 and L2 of the key phone interface unit 10 are stopped. Is missing. Accordingly, the relays RL3 and RL4 are switched to two voice lines L3 and L4 among the incoming lines to the key phone so that the external station lines T and R are connected to the inside of the key phone through the voice lines L3 and LB. do.

In FIG. 3, when the user recognizes that the LCD display of the keypad is turned off or the lamp of the room is turned off, and confirms that the power is cut off, the phone is turned on by manually turning on the switch SW connected to the voice line L3. It is operated by the power applied from T, R).

That is, when the user manually turns on the switching switch SW, the DC power conversion unit 12 connected to both ends of the voice lines L3 and L4 converts the power voltage supplied from the trunk lines T and R into a DC of a predetermined size. The voltage is converted into voltage and supplied to each circuit unit such as the CFU (4), the analog switch unit (6), and the tone / voice generator (7).

After that, if there is a ring signal flowing in through the external trunk lines T and R, the transmitter / receiver 8 is on-hook and the contact a of the hook switch H / S is connected to the contact c. The photo coupler (ISO) detects this and sends a predetermined electrical signal to the CPU 4 to recognize that the ring signal has arrived. At this time, the CPU 4 controls the analog switch unit 6 to set the path to the speaker and the microphone unit 9, and then controls the tone / voice generator 7 to generate a ring signal sound. When the user recognizes the ring tone and off-hooks the handset 8, the contact point a of the hook switch H / S is connected to the contact point b, and the transistor Tr senses a voltage change generated accordingly. And output to the CPU 4 through the transformer T3 and the analog switch unit 6, the CPU 4 recognizes that it is off-hook and controls the analog switch unit 6 to control the handset 8 and the voice line. By setting the communication path between (L3, L4), it is possible to transmit and receive voice signals through the amplifiers (Al, A2). Accordingly, the audio signal input to the transceiver 8 is transmitted to the trunk lines T and R through the analog switch 6, the amplifier Al, the transformer T2, and the audio circuits L3 and L4. The voice signals applied from the trunk lines T and R are received by the transceiver 8 through the voice lines L3 and L4, the transformer T2, the amplifier A2, and the analog switch unit 6.

As described above, in the key phone system of the present invention, when a power failure occurs, the voice line flowing into the key phone is connected to the trunk line, and the power supplied from the trunk line is changed to a predetermined DC voltage and supplied to each circuit unit in the key phone, and the ring is received through the trunk line. By detecting a signal and recognizing the CPU and setting a path for transmission and reception, it is possible to make a trunk line call even in the event of a power failure, thereby eliminating the inconvenience of having to have a separate telephone in a key phone system.

Claims (2)

In the key phone system, the main station A connects the external trunk lines T and R to the trunk line interface unit 11 during normal operation, and connects the external trunk lines T and R to the voice line L3, Relays RL3 and RL4 which perform switching operations in connection with L4); A switch (SW) connected to the voice line (L3) and operated by a manual operation to switch the connection of the voice lines (L3, L4) in case of power failure through the switch (SW) and the switch (SW). It is connected to the voice lines (L3, L4) and supplies the operating power by converting the power applied from the external main lines (T, R) through the voice lines (L3, L4) and the switching switch (SW) to a predetermined DC voltage The DC power converter 12 detects ring signals received from the external station lines 7 and R via the voice lines L3 and L4, and notifies the CPU 4 via the analog switch unit 6 and transmits the signals. And a trunk line interface unit (13) for informing the CPU (4) of the on / off hook of the receiver (8) via the analog switch unit (6). The audio circuit interface of claim 1, wherein the trunk line interface unit 13 includes a bridge diode BD for maintaining a constant power polarity across the voice lines L3 and L4, and a voice line from the external main lines T and R. Matching the connection between the photocoupler 150 and the analog switch unit 6, which detects a ring signal received through (L3, L4) and informs the CPU 4 via the analog switch unit 6; A hook switch (H / S) which is operated according to an on / off hook of a transformer (73) and the handset (8) and selectively connects the bridge diode (BD) to a transformer (T3) and a photocoupler (ISO). ) Is connected to the hook switch (H / S) and senses the on / off hook state of the handset / receiver (8) and informs the CPU (4) through the transformer (T3) and the analog switch unit (6). Is a key system, characterized in that it comprises a transistor (TR).