JPS583493A - Control system for telephone set - Google Patents

Abstract

PURPOSE:To smoothly change over the control with a control circuit at power failure or momentary interruption and the control with the other circuits, by monitoring the change in the power supply voltage and controlling the output of the control circuit with the output. CONSTITUTION:When a power is applied to a power supply input terminal POW, the 1st power supply circuit AVR1 rises, and the power supply is applied to the 2nd power supply circuit AVR2, an L relay circuit LR, and a telephone set power supply circuit T-POW. When the voltage drop of the AVR1 on mains failure is detected at a comparison circuit COMP, a control signal circuit T is restored and the information is applied to a reset circuit RES, a drive circuit L-DRIVE, and a switch circuit SW. Thus, a CPU of a main device ME is reset, a self-hold circuit SD is operative and an L relay is held during the operation of the L relay.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method for resetting a control system of a telephone device such as a key telephone device when power is turned on, turned off, or momentarily interrupted.

In a telephone device configured to supply power from one of the main device side and the telephone side to the other, the characteristics of the power supply circuit on the power supply side and the power receiving side change when the power is turned on, turned off, or momentarily interrupted. There was a drawback that synchronization of control operations could not be maintained because of the difference.

The present invention provides a control system for a telephone device that can easily and reliably perform a control system setup operation in a telephone device in which power is supplied from one of the main device side and the telephone side to the other. It provides:

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a block diagram of a key telephone device as an embodiment of the present invention, where ME is a main unit, 1 is one of the telephones, L is a communication path, and D is a power supply and data path. In the main device, co is the line input terminal, COC is the office line circuit, IOC is the extension circuit, RC is the incoming signal detection circuit, and TO
NE is a sound source circuit, t is a L IJ relay contact, POW is a power input terminal, AvRl is a first power supply circuit, CPU is a CPU circuit that operates as a central processing unit (control circuit), T
-POW is the telephone power supply circuit, TR is the data transmission/reception circuit, BU is the power outage backup power supply circuit, LR is L IJ
Sillage path, SD is the L IJ Sillage self-holding circuit during power outage, AVR2 is the second power supply circuit, RES is the seven-node circuit,
For example, SW is a switch circuit that includes a mono multivibrator for each input and controls temporarily turning off the output to the telephone power supply circuit after the input arrives, and L-DRIVE is a CPU circuit CP.
A drive circuit that drives the L relay by the output of U, D is a diode, p is a contact of P relay, H8,, H8
2 is a hook switch, NET is a communication circuit, R is a resistance, A
MP is the amplifier circuit, SP is the speaker, AVR-T is the telephone power supply circuit, P-DRIVE is the drive circuit that drives the P relay by the output of the CPU circuit, PR is the P relay circuit, LK is the office line button, and PK is the caller. It's a button.

During operation, when power is input to the power supply input terminal POW, the first power supply circuit AVR1 rises, and the second power supply circuit AVR2, L, relay circuit LR, and telephone power supply circuit T
- Power is supplied to POW. Second power supply circuit AVR2
supplies power to the reset circuit RES and the CPU circuit CPU.
Reset PU. After resent, the telephone power supply circuit T-POW is operated by the switch circuit SW, and power is supplied to the telephone set. After reset operation, CPU circuit CP
U detects the operating state of the L relay from the self-holding circuit SD, and if the L relay is self-holding, outputs an output to the L-DRIVE to operate the L relay. LI on standby
The J relay is operating, and its contact t is located at the position indicated by the dotted line, and is connected to the extension circuit rocVC. Data is exchanged between the main device ME and each telephone device by [:CPU circuit CP]
The process is bidirectional: U→data transmitting/receiving circuit TR→data path D→returning transmitting/receiving circuit TR-+CPU circuit CPU path. When the telephone device is supplied with power from the telephone power supply circuit T-POW, the telephone power supply circuit AVR-T operates, and the reset circuit RES resets the CPU circuit CPU.

The P relay in standby is not operating, and the contact p of the P relay
is on the hook switch side. If the telephone is off-hook, the telephone circuit NET is connected to the telephone line via the p contact and the hook switch H8l, and further connected to the extension circuit IOC via the contact t. By operating the call button 7PK, the call information from the CPU circuit CPU→data transmitting/receiving circuit TRI is transmitted through the data path, and in the main device ME, the CPU circuit CPU is connected to the sound source circuit TON.
E sends a ringing tone to the communication path. Called telephone (In Figure 1, the telephone installed indicates one of multiple connected telephones, and in order to distinguish between the calling telephone and the called telephone, '' is added to the circuit name of the called telephone. ), the CPU circuit CPU' detects the called state, drives the drive circuit P-DRIVE', and connects the P relay circuit PR.
'i' is operated and the amplifier circuit AMP' is brought into operation. This causes the called telephone to connect to the contact p' of the CP' rule.
→Resistance R'→Amplification circuit AMP'→Speaker SP'), a ringing tone is sent out. If the called telephone device' goes off-hook, the CPU circuit CPU' restores the P' relay by the hook switch H8'2, and the telephone call circuit NET' is connected to the telephone call circuit NET' via the hook switch H8'l. , the CPU circuit CPU of the main device stops the tone generator circuit TONE based on the information from the hook switch H8'2.
An extension call is established. Other phones restore P relay,
Goes into standby mode. An extension call goes into a standby state when both telephones go off-hook.

When there is an incoming call on the central office line, the incoming call detection circuit RC operates.

As a result, the CPU circuit of the main device ME is connected to the sound source circuit T.
At the same time as driving the ONE, data on the state of incoming calls on the central office line is transmitted to the telephone installed. The telephone installed CPU circuit CPU is P
Since the relay and amplifier circuit AMP are operated, a central office line ringing tone is transmitted from each telephone installation. By operating the station line button LK of the telephone station and going off-hook, the CP of the telephone station
The U circuit CPU replaces the P relay and the amplifier circuit AMP, connects the communication circuit NET to the communication path, and transmits the office line selection data to the main unit. Main device ME CPU circuit C
PU stops the tone source circuit TONE, restores the L relay, and directs its T contact toward the office line circuit COO side.

In addition, the P relay and the amplifier circuit AMP are restored for all telephones other than those that have gone off-hook, and the telephone enters a standby state. From then on, the telephone line was switched to a local telephone line due to the operation of the calligraphy.

At the end of the call, the telephone is put into a standby state by on-hook. Based on this on-hook information, the main unit operates the LIJ relay, and its t contact is connected to the extension circuit IOC side, and the telephone is put into a standby state.

To select the central line when making a central telephone call, press the central telephone button L on the telephone.
By operating K and off-hook, the communication circuit NET 1
1 switch H8I and the communication path LK are connected by the p contact. The main device ME restores the L'J relay based on the office line selection information, so the contact connects the communication path to the office line circuit COCl1.
llVC connection is made and it becomes possible to make a call to the central office line.

The button/telephone device has flashing lamp operation, dialing operation,
There are various functional operations such as a hold operation and a transfer operation, but these are omitted as they are unnecessary for the detailed explanation of the present invention.Here, operations related to a power outage during an incoming call on the central office line and during a telephone call on the central office line will be described. First, during a call, the station is connected to [office line input terminal CO→office line circuit C0C-+L IJ relay contact t→talk path L-+PIJ relay contact p→hook switch H8I→talk circuit NET]. , L relay,
Both P relays are being restored, so even if there is a power outage, this Q
The route is normally maintained and the central office line communication is not interrupted. However, the L relay is connected to the drive circuit L -DRI V
Since the L relay is connected to the output of the CPU circuit CPU via E, there is a problem in that the L relay operates instantaneously and opens the office line.

This is because while the power of the CPU circuit CPU is being turned off, its output may become unstable and cause the LIJ relay to operate.

Next, to explain the power outage operation during an incoming call on the office line, both the L relay and P relay operate while a call is being received on the office line, and the sound during an incoming call on the office line is [sound source circuit TONE-+ as contact point → communication path L → p Contact →
The signal is sent out from the speaker SP via a path from the resistor R to the amplifier circuit AMP. If there is a power outage here and the L relay is restored earlier than the P relay, [office line input terminal CO→
Office line circuit COC → T contact → Communication path L-+P contact → Resistor R
] path creates a DC loop to the office line, so if the L relay is operating during a power outage, it will hold itself for a certain period of time and wait for the P relay to recover before the L relay recovers. ing. In Fig. 1, this operates when the self-holding circuit SD of the L relay detects a power outage.
Power for the L relay is supplied by the power failure bank-up power supply circuit BU. The problem with such circuits is when the power supply is momentarily cut off.

This means that this device transfers the output from the first power supply circuit AVRI to the second power supply circuit AVR2 and the telephone power supply circuit T-.
Since the power is supplied to the telephone power supply circuit AVR-T via POW, the second power supply circuit AVR2 and the telephone power supply circuit Av
The falling and rising timings of the m-T output do not match. Therefore, although the power supply circuit AVR-T on the telephone side maintains the power supply circuit AVR-T, the power supply circuit AVRI on the main device ME side
There are cases where AVR2 crashes first. When the power supply to the power input terminal POW is restored in this state, the CPU circuit CPU on the other side of the main device is reset by the reset circuit RES. If the reset time of the reset circuit RES is long, the self-holding circuit SD has released its operation upon power recovery, and the CPU circuit CPU is being reset and the drive circuit L-DRIVE does not operate.
Then, the relay is restored and the contact is connected to the station line circuit COC side, creating a loop for the station line and capturing the station line. After being reset, the CPU circuit CPU of the main device ME does not drive the drive circuit L-DRIVE in order to continue the state of the L relay, but since the incoming signal from the station is stopped due to the station line capture operation, the incoming signal detection circuit RC is restored, and the CPU circuit CPU shifts to standby operation. Therefore, the L relay operates and is connected to the extension circuit IOC side, releasing the office line, resulting in so-called invalid capture. Also, as mentioned in the above explanation, even though cptr @ approximately cpU on the main device ME side is reset during a momentary power outage, the CPU circuit CF'U on the side where the phone is placed horizontally
There is also the inconvenience of not being reset.

This point will be further explained with reference to FIG.

The first power supply circuit AVR1 starts up at t and becomes stable at t3. At tl, the second power supply circuit AVR2 becomes stable and the main device ME is reset. The telephone power supply circuit T-POW starts up at t2 after a certain period (τ) after the main device ME is reset.

The first power supply circuit AVRI begins to decrease at t4, recovers at t5, and stabilizes at t6. At this time, the second power supply circuit AVR2 of the main device ME may decrease depending on the current consumption and perform a reset operation, and if the telephone power supply circuit AVR-T is stable when the telephone is placed horizontally, the telephone may be placed horizontally. is not reset. In this way, although the main device ME has been reset, the telephone TFJL has not been reset, which causes operational inconvenience. Also, L of the main device ME
1. When a telephone call is received on the central office line, the P relay continues to operate, but the L relay recovers due to the reset operation, resulting in an invalid acquisition of the central office line. There was a problem with it getting stuck.

The power is cut off at t7, and the first power supply circuit AVR1 becomes zero volts at t8. At this time, if the L relay is restored and the 21st talk is in progress, the second power supply circuit AVR2 is in the process of decreasing and the CPU circuit CPU0 output becomes unstable, the L relay operates, and the station There was a problem that the line was left open.

As explained above, the circuit shown in FIG. 1 has problems such as when the central office line is disconnected due to a power outage during a call on the central office line, and when a call is interrupted during an incoming call on the central office line, resulting in invalid capture.

FIG. 2 shows an embodiment of the present invention that can eliminate such drawbacks, and the same circuits and abbreviations as in FIG. 1 are the same, and the operations are the same. In Figure 2, DL is the first power supply circuit AVRI
REF is a reference voltage circuit, COMP is a comparison circuit that outputs a detection output when the output voltage of AVRI exceeds the output of the reference voltage circuit REF', T is a control signal circuit, such as a relay, which outputs a voltage change state based on the output of the comparator circuit COMP.

When power is input to the power input terminal POW, the first power supply circuit AVRI rises and supplies power to the second power supply circuit AVR2, L') relay circuit LR, and telephone power supply circuit T-POW via the delay circuit DL. is supplied. The second power supply circuit AVR2 includes a reset circuit RES and a CPU circuit CPIJ.
Supply K power. Here, the comparison circuit COMP operates the control signal circuit T when the output voltage of the first power supply circuit AVR1 exceeds the set value of the reference voltage circuit REF. ? The I11 elevation signal circuit T uses this output to reset the reset circuit RES, the drive circuit L-LDRIVE, and the telephone power supply circuit T.
- Inform the switch circuit SW that controls POW. As a result, the CPU is reset, the drive circuit L-DRIVE receives the output from the CPU circuit CPU17), and power is supplied to the telephone by the telephone power supply circuit T-POW.

After that, the L IJ relay of the CPU circuit CPU is energized.

The operations such as standby operation, extension call and 9-station line call are the same as those described in FIG. 1, and will therefore be omitted.

During a power outage, when a voltage drop in the first power supply circuit AVR1 is detected by the comparator circuit COMP, the control signal circuit T is restored and the information is transferred to the reset circuit RES and the drive circuit LD.
RIVE, transmit to the switch circuit SW. As a result, the CPU circuit CPU of the main device section is reset, and the CPU
The program-based operation of the 1-path CPU is stopped and the other circuits start operating. First, the first power supply circuit AVR1
The self-protection circuit SD operates due to the voltage drop, and if the L relay is in operation, it holds the L relay. Power at this time is supplied by the power failure backup power supply circuit BU. Until the output of the first power supply circuit AVRL is reduced and the control signal circuit T is restored, the voltage of the second power supply circuit AVR2 is kept stable by the delay circuit DL. Drive circuit L −
Since DRI VE is ORed with the output of the control signal circuit T, after the control signal circuit T is restored, the CPU circuit CP
Does not accept U output. Therefore, there is the inconvenience that when a power outage occurs during a telephone call on the central office line and the power supply voltage of the CPU circuit CPU decreases, the L relay operates due to the unstable output of the CPU circuit CPU, opening the central office line. will disappear. When the disconnected L relay is operating, the holding circuit SD holds itself by the control signal circuit T, and at the same time, the switch circuit Sw
As a result, power to the telephone is cut off from the telephone power supply circuit T-POW. When the power to the telephone station is cut off, the P relay is restored.

In addition, even if the first power supply circuit A1 is restored due to a momentary power interruption, its output voltage reaches the set value of the reference voltage circuit REF and an output is output from the comparison circuit COMP, and the control signal circuit T operates and starts over from the main unit, telephone connection, and 7-node operation, so even if the reset time is long and the self-holding circuit SD is restored and the L IJ relay is restored, the P relay of the telephone is restored at that time. Therefore, even if there is a momentary interruption while receiving a call from the central office line, invalid acquisition will not be performed. In addition, if there is a momentary power outage and the control signal circuit T is restored, the main device ME must
Since the telephone device and the reset operation are restarted, there is no problem that the telephone connection is not reset even though the earthen +lj ME has been reset.

The operation of the embodiment of FIG. 2 will be described in further detail with reference to FIG.

At to, the first power supply circuit AVR1 becomes stable at t3. ? When the output of the first power supply circuit AVR1 reaches the set voltage vBKF of the reference voltage circuit REF at time T, the control signal circuit T operates, and the reset operation of the main device section is completed at time t2. At this time, since the second power supply circuit AVR2 is stable, seven-step operation can be performed reliably.After a certain period (.tau.) from 0t2, at t4, the telephone power supply circuit T-POW is turned on and the telephone is set.

The first power supply circuit AVR1 starts to decrease at t5, recovers at t7, and stabilizes at txo. Here, since the control signal circuit T is restored for a period from t6 to t8, the telephone power supply circuit f-po
W is also not supplied for a period from t6 to tll. Therefore P I
During this period, the telephone line has been restored and the telephone connection is reliably performed, so that the above-mentioned inconvenient operation in the embodiment of FIG. 1 does not occur.

Even if there is a power outage at t12 and the first power supply circuit AVR1 drops to zero volts at t14, the control signal circuit T is restored at tt3 and the CPU circuit CPU of the main unit ME is reset, so the output of the CPU circuit dPU Malfunctions due to unstable output do not occur.

Note that an example of a specific circuit configuration of the reset circuit RES and the voltage comparison circuit COMP in the present invention is shown in a patent application filed on the same date by the applicant of the present application under the title of the invention "Reset Circuit."

As explained above, according to the present invention, changes in the power supply voltage are monitored and the output is used to perform the reset operation and control the output of a control circuit such as a central processing unit.
This has the effect of smoothly switching between control by the control circuit and control by another circuit during a power outage or instantaneous interruption.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a button telephone device as an embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, and FIG. 3 is an operation of the embodiment of FIG. 1. FIG. 4 is a time chart for explaining the operation of the embodiment shown in FIG. 2. R2H...Main equipment, Place...Telephone, L...Communication path, D...Power and data path, CO...Office line person-power terminal, COC...Office line circuit, IOC・・Extension circuit, R
C...Incoming signal detection circuit, TONE...Tone source circuit,
t...L IJ relay contact, POW...power input terminal, AVRI...first power supply circuit, CPU...CP
U circuit (control circuit), T-POW...telephone power supply circuit, TR...data tower receiving circuit, BU...power outage backup power circuit, LR...L relay circuit, SD/
... L relay self-holding circuit, AVR2 ... second power supply circuit, RES ... reset circuit, SW ... switch circuit, L -DRI VE ... drive circuit, D.
...Diode, p...P relay contact, H8,,H
82... Hook switch, NET... Call circuit, R
...Resistor, AMP...Amplification circuit, SP...Speaker, AVR-T...Telephone power supply circuit, P-DRI V
E...drive circuit, PR...P relay circuit, LK
...Central line button, PK...Call button, OR...
OR circuit, DL...delay circuit, REF...reference voltage circuit, COMP...comparison circuit, T...control signal circuit. Patent Applicant: Iwasaki Tsushinki Co., Ltd. Representative of Nippon Telegraph and Telephone Public Corporation: Manabu Amaba, Yuichi Hakusui ← 1) Σ Tonhee Ta

Claims (3)

[Claims] (1) A communication path through which central line communication current and extension communication current flow, a power supply path through which power supply current is supplied from one side of the main device to the other from the telephone side, and control between the main device and each of the telephones. a plurality of control circuits provided respectively in the main device and each telephone to carry out the operation; a data transmission path for mutually transmitting each output signal of the plurality of control circuits between the main device and each telephone; a main reset circuit for performing a reset operation of the control circuit provided on the main device side or the telephone side that supplies the power supply current among the control circuits;
a switching circuit provided on the main device side or the telephone device side that supplies the power to control the power supply to the power supply path to be temporarily stopped by the output of the base J set circuit; and the main device and a slave reset circuit provided on the other side of the telephone side for resetting the control circuit on the other side when power is supplied to the power supply path. . (2) A communication path through which central office line communication current and extension communication current flow, a power supply path through which power supply current is supplied from one of the main device side and the telephone side to the other, and control between the main device and each telephone device. a plurality of control circuits respectively provided in the main device and each telephone to perform the operation; a data transmission line for mutually transmitting each output signal of the plurality of control circuits between the main device and each telephone; and the power supply voltage. a voltage detection circuit that outputs a detection output when the voltage is below a predetermined voltage, and a main reset circuit that uses the detection output to reset the control circuit provided on either the main device side or the telephone; a switching circuit provided on the main device side or the telephone device side that supplies the power to control temporarily stopping the power supply to the power supply path based on the detection output of the voltage detection circuit; and the main device and a slave reset circuit provided on the other side of the telephone side and configured to reset a curved object control circuit on the other side when power is supplied to the power supply path. method. (3) Station) 9 A communication path for passing a communication current and an extension communication current, a power supply path for supplying power supply current from one side of the main device and the telephone to the other, and control between the main device and each of the telephones. a plurality of control circuits respectively provided in the main device and each telephone to carry out the above; a data transmission path for mutually transmitting each output signal of the plurality of control circuits between the main device and each of the Km machines; a voltage detection circuit that outputs a detection output when the power supply voltage is below a predetermined voltage; and a reset circuit that uses the detection output to perform a reset operation of the control circuit provided on the main device side or one of the telephones. . A control system for a Kame 1 talk device, comprising: a control means for controlling an output of the control circuit that performs a reset operation by the reset circuit, using the detection output.