JP2001186278A - Terminal network controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal network controller which can be charged in a standby or ringer mode when the electric power is bed from a telephone line and also can be quickly charged even in an installation construction mode. SOLUTION: A rectifier circuit 61 is prepared to rectify the voltage polarity of a telephone line together with an insulation resistance 62, a power supply capacitor 63 and a constant voltage circuit 64 to get the electric power even in a standby mode. In such a constitution of a terminal network controller, a fast charging circuit 66 is added in a parallel to the resistance 62 to obtain the electric power. Furthermore, a two-step charging circuit is constructed in addition to the circuit 66 by means of a loop control circuit of a calling communication mode power circuit. Thus, the terminal network controller can be charged even in a fully discharged state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device connected to a center device using a telephone line, and performs no-ringing communication with the center device and a terminal call communication from a terminal network control device. The present invention relates to a terminal network control device for the purpose of automatically reading meter of a city gas, electricity, water, or the like, and for detecting the state of a make sensor terminal.

[0002]

2. Description of the Related Art A non-ringing communication system to which a conventional terminal network control device (hereinafter sometimes referred to as an NCU) is applied, as shown in FIG. Control device (hereinafter C-
The NCU 6 is connected to the NCU 6 by a meter 7, a sensor 8, and a home telephone 9 respectively.

The center unit and the terminal unit are connected to a center exchange 3 and a terminal exchange 4 via telephone lines 12 and 14, respectively, and both exchanges 3 and 4 are connected via an interoffice trunk line 13. Connected. A no-ringing trunk 5 is connected to the terminal-side switching center 4 via a connection line 15.

[0004] In such a configuration, the NCU 6 conventionally has a battery (lithium) mounted thereon and operates on its energy. At the design stage, the capacity of the battery is determined by summing up the expected operating currents and allowing some margin.

[0005] However, the prediction is only a prediction, and there is a problem that the battery becomes unusable due to an unexpected usage or a drop in the battery capacity due to an unexpected operating environment. Was.

In order to solve this problem, not only primary batteries such as lithium batteries, but also Japanese Patent Application Laid-Open No.
As is known in Japanese Patent Application Laid-Open No. 317081, and Japanese Patent Application Laid-Open No. 5-91209, the life of a battery is extended by supplying power from a telephone line.

Further, regarding the separation of the meter and the telephone line,
A circuit separated from a telephone line by an optical coupling element (for example, a photocoupler) is known as a known example in Japanese Patent Application Laid-Open No. 9-205493, and a primary battery is connected to the meter connection side of the circuit separated by the photocoupler. Is provided.

[0008]

However, as in the above-mentioned known example, even though power is obtained from the line, in the steady state, the insulation resistance of the NCU is defined to be 1 MΩ or more, so that the NCU has a weakness of 48 μA or less. Inconvenience that only a small current can be obtained, and during no-ringing (NR) communication,
Also, during the terminal call communication, a half loop current (about 10 mA or less) and a loop current (more than 20 mA and less than 120 mA) can be obtained, but there is a possibility that energy is exhausted during the operation to shift to the communication operation. .

Further, when a call is made from the meter, or when reading data such as a meter reading from the meter,
Since only a weak current of 48 μA or less can be charged from the line and the NCU operating current needs to be around 10 mA, there is a problem that the energy of the secondary battery or a relatively large capacitor runs out. Was needed.

Further, when the initial NCU is installed, the capacitor is in a completely discharged state, and it is necessary to provide a battery in parallel with the capacitor until the NCU operates normally. Also, in order to initially charge this capacitor, a means for initializing the NCU by simply connecting it to the line was required.

When the voltage of the telephone line is stopped during normal operation due to an accident or the like, the main control circuit (CPU) of the NCU is operated in a state where the telephone connected to the NCU is separated from the line.
If the circuit is in an indeterminate operation area, the telephone cannot be used even if the line is restored, which may inconvenience the user.

In the case of a circuit configuration in which a photocoupler is used for the meter interface circuit and the telephone line side is electrically insulated, a primary battery is required on the meter side of the meter interface circuit, so that meter communication is frequently performed. In this case, there is a problem that the primary battery is consumed.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an insulation resistor for taking in power from a telephone line, and an electric power connected to each circuit of the terminal network control device via the insulation resistor. A terminal network control device that eliminates the need for batteries by employing a configuration that includes a power supply capacitor for supplying power and a high-speed charging circuit that is connected in parallel with the insulation resistor and can charge the power supply capacitor at high speed. It is intended to provide.

The terminal network control device is a device for transmitting and receiving data using a telephone line. The LP is for reading a meter such as a gas, city gas, electricity, water, etc. It is intended for those that can take power from the line.

The circuit for taking in power from the telephone line includes an insulation resistor for taking in power from the telephone line, and a power supply capacitor charged through this insulation resistance to supply power to each circuit of the terminal network control device. And a constant voltage circuit for protecting the withstand voltage of the capacitor, and a circuit configuration in which electric power is taken from a line during standby and charged.

The insulation resistance is a sum of the line voltage of 48 V, the operating current when the terminal network controller is in a standby state, and the sum of the leakage current expected in the future of the product life of the power supply capacitor. It is desirable to set the value to 1 MΩ or more that can secure and satisfy the connection condition to the telephone line.

The current charged in the power supply capacitor via the insulation resistor is a very small current. When the capacitor is completely discharged, such as during the initial installation of the NCU, the electric power operated by the terminal network control device is reduced. Not always available. Therefore, a high-speed charging circuit is connected in parallel with the insulation resistor to enable high-speed charging from a completely discharged state of the power supply capacitor to a minimum voltage at which the terminal network control device can operate normally.

The high-speed charging circuit includes a transistor and a resistor connected to short-circuit the insulation resistor;
A Zener diode connected to the base side of the transistor, and when the emitter voltage of the transistor becomes lower than the Zener voltage of the Zener diode, the transistor is turned on to short-circuit the insulation resistance, and the power supply capacitor is connected via the resistance. A configuration in which charging can be performed can be exemplified.

The current value charged by the high-speed charging circuit is set to a resistance value, for example, 2 kΩ or more, so that the current value (about 20 mA) detected by the central office exchange as a loop (line seizure) is not more than the current value. The configuration is preferred. With such a configuration, charging can be performed at a higher speed than when charging the power supply capacitor via the insulating resistor.

Further, in order to charge the power supply capacitor at a high speed in the initial installation work or the like, a configuration using a loop control circuit for controlling the acquisition of the line can be adopted in addition to the high-speed charging circuit.

That is, a two-stage charging circuit is provided for charging the power supply capacitor, and as the first charging circuit, the high-speed charging circuit capable of charging at a loop current or less to a minimum voltage value at which the main control circuit can operate is provided. A charging circuit is connected in parallel with an insulation resistor, and as a second charging circuit, a loop control circuit for capturing and controlling a telephone line is used, and a minimum voltage at which a main control circuit (for example, a semiconductor constituting a CPU circuit) can operate. A low voltage detection circuit that detects the start of operation and starts operation, a charge control circuit that controls the loop control circuit based on the output of the low voltage detection circuit, and charging control that continues charging for a certain period of time after the low voltage detection circuit is turned off By adopting a configuration that includes a charge control capacitor with a time constant so that the circuit can operate, the power supply capacitor can be easily charged using the loop control circuit. be able to.

When the charging of the power supply capacitor is completed by the above-described two-stage charging circuit and the initialization of the CPU circuit is completed, the operation is continuously performed, and the initialization of the terminal network control device is completed at a predetermined center. It is desirable to have a configuration in which a terminal call is made in order to convey that the information has been transmitted, and predetermined information is transmitted and received. The telephone number required for this terminal call is stored in advance in the memory of the NCU, but it is assumed that the power supply capacitor of the NCU is completely discharged, so that the telephone number required for the terminal call can be stored. The memory is preferably a non-volatile memory. Further, it is preferable that the initial telephone number stored in the nonvolatile memory is written into the nonvolatile memory during the production process as a unique telephone number such as for each area to be shipped.

As described above, a circuit for charging with a weak current through an insulation resistor, a high-speed charging circuit, and a charging circuit using a loop control circuit have been described. Instead of these various charging circuits, a power supply capacitor is used. It is also possible to adopt a configuration in which the power supply capacitor is manually charged at a high speed from a battery or the like at the time of initial construction by connecting to both end circuit portions.

As another charging circuit, it is also possible to adopt a configuration in which charging is performed using electric power at the time of telephone ringing (ringer) input. That is, as a ringer-based charging circuit, a capacitor that cuts the DC voltage of the telephone line,
If a configuration including a resistor that satisfies the AC impedance at the time of inputting a telephone call signal (ringer), a rectifier circuit that rectifies the AC signal, and two zener diodes that pass a ringer voltage of 60 V or more is used, At the time of input, a voltage of 60 V or more is supplied to the power supply capacitor side, thereby enabling charging of the power supply capacitor.

Furthermore, if the charging circuit using the ringer and the telephone disconnection circuit are used, the power supply capacitor can be charged from the portable telephone. That is, N
The CU is equipped with a ringer-based charging circuit and a telephone disconnection circuit. After disconnecting the telephone, and after completing the installation work, calling the customer's home from a mobile phone, etc., the power supply capacitor can be charged from the ringer-based charging circuit. .
In this case, the disconnected telephone may be returned after charging is completed.

Next, a means for supplying power to the meter connected to the NCU will be described. In a meter interface circuit in which an NCU and a meter are electrically insulated by an optical coupling element (for example, a photocoupler) and separated from a telephone line, a power supply system on a CPU circuit side which is separated without using a battery as a power supply on the meter side. If power is supplied from
If a drive circuit and a pulse transformer are provided on the CU side, a capacitor is provided on the meter side, and the meter side capacitor is charged via the NCU drive circuit and the pulse transformer, it is necessary to provide a battery on the meter side. Disappears.

The NCU-side drive circuit is composed of two types of capacitors, a low-capacity capacitor and a large-capacity capacitor, and a transistor for switching the capacitors, and can operate as a drive signal in two modes, intermittent and continuous. If the configuration is adopted, when the NCU is in the standby state and it is necessary to reduce the current consumption of the circuit, it operates intermittently with a low-capacitance capacitor, and when a large current is consumed such as communication with a meter, it operates continuously with a large-capacity capacitor. Can be done.

Although the telephone is disconnected from the line during a terminal call or the like, means for preventing the power supply capacitor from running out of power after the telephone disconnection and preventing the telephone from recovering is adopted. Is preferred.

A low-voltage detection circuit is newly provided as a return circuit, and the detection level is set to a voltage higher than a voltage at which a reset-side coil for conducting the connection terminal of the telephone can be driven.
In addition, if the main control circuit is set to a voltage lower than the inoperable level and the reset coil is continuously driven independently of the operation of the main control circuit (CPU circuit), the power can be reduced during a terminal call or the like. Even if the power of the supply condenser runs out,
There is no worry that the home telephone will not be usable.

The home telephone is usually connected to a disconnection circuit having a relay contact, and this relay contact is opened and closed by a set-side coil or a reset-side coil of a drive circuit (relay drive circuit). ing. Therefore, if the signal from the low-voltage detection circuit is configured to be input to the relay drive circuit, the NCU may not be supplied with the DC voltage due to a telephone line accident or the like, and the power supply capacitor may be discharged. The detection circuit detects the voltage of the power supply capacitor, and continues to drive the reset side coil independently of the main control circuit (CPU circuit) to connect the telephone to the telephone line.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] The configuration of an NCU according to a first embodiment of the present invention will be described with reference to FIGS. The system configuration to which NCU 6 is applied is as follows:
This is basically the same as the configuration shown in FIG. 10 described in the section of “Prior Art”. Therefore, in the following description,
Only the characteristic configuration of the present embodiment will be mainly described, and the configuration shown in FIG. 10 will be referred to again as needed.

FIG. 1 is a block diagram showing a circuit configuration of the NCU 6. In FIG. 1, the NCU 6 includes a reciprocity detection circuit 80 for detecting the reversal of the polarity of the telephone line, a rectifier circuit 61 for rectifying the voltage polarity of the telephone line, an insulation resistor 62 for taking in power from the telephone line, and an insulation resistance The power supply capacitor 63 includes a power supply capacitor 63 that charges energy via the power supply capacitor, a zener diode (constant voltage circuit) that protects the voltage of the power supply capacitor 63, and a high-speed charging circuit 66 that is connected in parallel to the insulation resistor 62.

In addition, the following configuration is provided. That is, in FIG. 1, reference numeral 67 denotes an outgoing call communication power circuit also serving as an off-hook control circuit, 72 denotes a PB transmission / reception circuit, and 70 denotes C
PU circuit (main control circuit), 79 is a terminal (meter, etc.)
7 and 8 are meter interface circuits. 74 is a non-volatile storage circuit (EEPROM) for storing setting data set in the CPU circuit 70, and 82 is a CPU circuit 7
A reset circuit 65 for resetting 0 and an NR communication power circuit 65 having substantially the same circuit configuration as the call communication power circuit. 81 is a charging circuit using a ringer, 75 is a telephone disconnection circuit, 73 is a modem unit, and 77 is an off-hook detection circuit after disconnecting the telephone.

As shown in FIG. 1, the lines L1-L2 are connected to a rectifier circuit 61, the rectified positive output is connected to one end of an insulation resistor 62, and the other end of the insulation resistor 62 is connected to the plus side of a power supply capacitor 63. It is connected. A zener diode 64 is connected in parallel with the power supply capacitor 63.

In a standby state where the telephone 9 connected to the NCU 6 and T1-T2 does not perform communication, the lines L1-L2
Is applied to the power supply capacitor 63 via the rectifier circuit 61 and the insulation resistor 62, and is charged with a weak leakage current.

The insulation resistor 62 has a line voltage of 48 V and an NCU.
6 can secure a current value of the sum of the operating current in the standby state and the expected increase in the future leakage current due to the product life of the capacitor 63, and a value of 1 MΩ or more that satisfies the connection conditions to the telephone line. The value is specifically set to 1.2 MΩ.

FIG. 2 is an explanatory diagram of the high-speed charging circuit portion of FIG. 2, the high-speed charging circuit 66 includes a transistor 663, resistors 665, 611, 622, and a Zener diode 644. Transistor 6
63 is configured to short the insulation resistor 62, and the emitter voltage of the transistor 663 is
When the voltage becomes lower than the Zener voltage of 44, the transistor 63
3 turns ON, the insulation resistor 62 is short-circuited, and the power supply capacitor 63 can be charged with a large current via the resistor 665.

By setting the resistance 665 of the high-speed charging circuit 66 to a value of 2 kΩ or more, the charging current is set to 20 mA or less, which is lower than the current detected by the exchange as a loop (line capture). The capacitor 63 can be charged at a higher speed than when charging.

FIG. 3 is an explanatory diagram of the call communication power circuit of FIG. In FIG. 3, a high-speed charging circuit 66 is used as a first-stage charging circuit, and a loop control circuit 67 that controls line capture is used as a second-stage charging circuit.

That is, the second-stage charging circuit includes a loop control circuit 67 for capturing and controlling a telephone line, and a main control circuit (C
PU), and a low-voltage detection circuit 69 that starts operation by detecting a minimum voltage at which it can operate, and a charge control circuit 71 that controls a loop control circuit 67 based on the output of the low-voltage detection circuit 69.
And a charge control capacitor 72 having a time constant so that the charge control circuit 71 can be operated by continuing charging for a certain period of time after the low voltage detection circuit 69 is turned off.

The loop control circuit 67 includes the transistor 6
76, 673, an impedance matching circuit 677, and resistors 671, 672, 674, 675. The low voltage detection circuit 69 is configured to detect the voltage of the power supply capacitor 63 and output a low level (L) signal if the voltage is lower than a predetermined value.

The charge control circuit 71 includes a transistor 71
1 and resistors 712 and 713, and the charge control capacitor 72 is connected to the base side of the transistor 711 via the resistor 713.

In the charge control circuit 71, if the voltage of the power supply capacitor 63 detected by the low voltage detection circuit 69 is lower than a predetermined value, the charge control capacitor 72 is discharged, but the power supply capacitor 63 is charged. Is higher than a certain value, the charge control capacitor 72 is charged via the resistor 713, and after a certain time delay, the base resistance 713 of the transistor 711 is raised to the H level and the transistor 711 is turned off. ing.

In the loop control circuit 67, the transistor 676 is arranged so that the impedance matching circuit 677 operates instead of the insulating resistor 62. When the low voltage detection circuit 69 detects the L level, the charge control capacitor 72 The transistor 673 is turned on via the transistor 711, and then the transistor 676 is turned on.
As a result, the impedance matching circuit 677 operates.

The impedance matching circuit 677 has an NCU
6 forms the impedance when looping,
When the second-stage loop control circuit 67 operates, the line is looped and the loop is released after a certain time delay from the detection of the voltage of the power supply capacitor 63 by the low-voltage detection circuit 69.

If charging proceeds with the two-stage charging circuit, CP
The U circuit 70 is initialized (reset) by a reset circuit 82.
It is in a standby state until charging is completed. Further, the output of the low voltage detection circuit 69 is also input to the CPU circuit 70,
The charging completion time can also be known on the CPU circuit 70 side.

After the charging is completed, the center number is continuously operated by dialing or the like, and a terminal call is transmitted to inform the center that the initialization of the NCU 6 has been completed. The NCU 6 includes a nonvolatile storage circuit 74 such as an EEPROM capable of storing a telephone number and a terminal ID required for the terminal call. In addition, the CPU circuit 70 prepares some commands for writing the telephone number and the terminal ID required for the terminal call into the nonvolatile memory circuit 74, but the description is omitted here.

In the manufacturing process of the NCU 6, the checker responsible for the inspection is provided with means for managing information such as the serial number of the NCU 6 and the shipping destination after production. Checker is N
The CU 6 is inspected, and for the products that have passed, a search is made for the shipping destination center number from the shipping destination based on the management information, and NC
The terminal ID is obtained from the serial number of U6, and is written in the nonvolatile memory circuit 74 by using the write command.

FIG. 4 is an explanatory diagram of a ringer-based charging circuit connected to connection terminals LL of a telephone line. The ringer use charging circuit 81 includes a capacitor 755 that cuts the DC voltage of the telephone line, a resistor 753 that satisfies the AC impedance when a telephone call signal (ringer) is input, a rectifier circuit 754 that rectifies the AC signal, and a ringer generated. A Zener diode 751 that supplies a voltage of 60 V or more,
752, and when the ringer is input, the voltage of the ringer output from the rectifier circuit 754 at a voltage of 60 V or more is supplied via the resistor 756 to the power supply capacitor 6.
3 constitutes a charging circuit.

Also, as shown in FIG. 1, a telephone disconnection circuit 75 is provided between the line terminals L1-L2 and the telephone connection terminals T1-T2.
If the charging circuit 81 in the ringer as shown in FIG. 4 is used, the worker disconnects the telephone so that the bell of the telephone does not ring when the installation is completed. A call can be made to charge the power supply capacitor 63. After charging is completed, return the disconnected telephone. The telephone disconnecting circuit 75 has a relay contact circuit configuration (see FIG. 9).

FIG. 5 is an explanatory diagram of the meter interface circuit of FIG. In the meter interface circuit 79 separated from the telephone line by the photocouplers 796 and 797, the C that operates without using a battery using the power of the line.
A power supply capacitor 795 provided on the meter side as a power source on the meter side is charged from a power supply system on the PU circuit 70 side via a drive circuit 791 and a pulse transformer 792. And the telephone line side (primary side) of NCU6
And the meter side are electrically insulated by photocouplers 796 and 797 and a pulse transformer 792.

FIG. 6 is an explanatory diagram of the drive circuit shown in FIG. 5, in which the MOSFET (C
MOS) 800, 801 and a capacitor 802. The CPU circuit 70 executes the CMO
The input section of S is controlled to be at H level and L level. Then, the capacitor 802 repeatedly charges and discharges in that cycle, so that the pulse transformer 792 is driven to induce a voltage on the meter side. The voltage is rectified by rectifying diodes 798 and 794, and
5 will be charged.

[Second Embodiment] FIG. 7 is an explanatory diagram showing a connection state between a charging terminal of an NCU and a setting device according to a second embodiment. In the NCU 6 of the present embodiment, both ends of the power supply capacitor 63 are led to the charging terminal 78 on a connection terminal block such as a meter by printed wiring.

On the other hand, the power supply 412 is also provided on the setter 41 side.
Large capacity capacitor 41 that can temporarily store power from
1 is provided, which can be connected to the charging terminal 78. The setting device 41 displays “Charge” in the operation menu.
There is an item, and by manipulating it, it is possible to instruct the large-capacity capacitor 411 to store power.

The NCU 6 having the above configuration performs the above operation at the start of the installation work, stores the electric power in the large-capacity condenser 411 of the setting unit 41, and when the work is completed, sets the setting unit 41.
Is connected to the charging terminal 78 of the terminal block of the NCU, the power supply capacitor 63 can be charged at a high speed.

[Third Embodiment] FIG. 8 is an explanatory diagram of a switching circuit of a drive circuit in the NCU 6 of the third embodiment. In the present embodiment, a capacitor switching circuit 810 is added to the capacitor 802 of the drive circuit 791 shown in FIG. 6, and the capacitor switching circuit 810 includes the FET 803 and the switching capacitor 80.
4, one of the capacitors 802 and 804 is a large-capacity capacitor, and the other is a small-capacity capacitor, and the two are switched according to the difference in power consumption on the meter side.

Further, when the CPU circuit 70 is in the standby state, the power consumption of the meter side is extremely reduced.
The U circuit 70 also includes a means for intermittently driving a drive signal driven by the drive circuit 791. The CPU circuit 70 also includes a unit for changing the duty ratio of the drive signal that is intermittently driven, thereby preparing for various meter-side power consumptions.

In particular, it is necessary for the CPU circuit 70 to wake up periodically for a certain period of time in order to measure the time. If this time is used for driving, the CPU circuit 70 may be used only for the purpose of charging the power on the meter side. You don't have to get up.

[Fourth Embodiment] FIG. 9 is an explanatory diagram of a relay drive circuit of an NCU according to a fourth embodiment. The latching relay drive circuit 85 includes transistors 850 and 851 and resistors 852, 853 and 85
4, 855 and the latching relay coil 85
6 and 857 to switch the contact portion of the telephone disconnection circuit 75 between the set side and the reset side.

Connection points L1-L2 between NCU 6 and the telephone line
From the telephone via the latching relay contact
When the NCU 6 makes a terminal call in the relay drive circuit 85, the CPU circuit 70 controls the telephone to switch to the set side and disconnect from the telephone line for communication.

Now, during communication, the power supply condenser 63
If the voltage drops to a region where the CPU circuit 70 cannot operate, the telephone may be left unattended from the set side, that is, disconnected from the telephone line.
Therefore, as shown in FIG. 9, the output of the low-voltage detection circuit 69 and the output of the CPU circuit 70 are connected to the relay drive circuit 85 by taking a wired OR, and the reset-side coil 856 is independently connected to the CPU circuit 70. It can be driven.

The low voltage detection circuit 69 is configured to output an L level when the voltage of the power supply capacitor 63 is low, and forcibly sets the base of the transistor 851 to the L level.
Thus, the reset side coil 856 can be driven independently of the CPU circuit 70. This allows
Even if the voltage of the power supply capacitor 63 decreases, the telephone can always be used.

Here, it goes without saying that the detection level of the low-voltage detection circuit 69 is higher than the voltage at which the reset-side coil 856 can be driven and lower than the voltage at which the CPU circuit 70 becomes inoperable.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made within the scope of the present invention. For example, the first
In the third embodiment, the configuration provided with the connection terminal of the second embodiment, or the third embodiment and / or the fourth embodiment have the first connection terminal.
Any of the configurations obtained by combining the embodiment and / or the second embodiment can be adopted.

[0065]

As is apparent from the above description, according to the present invention, even during standby, power for standby can be received from the line via the insulation resistance, and a high-speed charging circuit and / or a loop control circuit is employed. Or by using a ringer, power can be obtained.
It is very economical because there is no need to mount a battery that holds the energy for the life of the battery. Further, even if the power of the condenser is lost during the calling of the meter or the like, there is no fear that the home telephone cannot be used, which is very convenient.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an NCU according to a first embodiment;

FIG. 2 is an explanatory diagram of a high-speed charging circuit.

FIG. 3 is an explanatory diagram of a power circuit during call communication.

FIG. 4 is an explanatory diagram of a ringer-based charging circuit.

FIG. 5 is an explanatory diagram of a meter interface circuit.

FIG. 6 is an explanatory diagram of the drive circuit of FIG. 5;

FIG. 7 is an explanatory diagram showing a connection state between a charging terminal of an NCU and a setting device according to the second embodiment;

FIG. 8 is an explanatory diagram of a drive circuit in an NCU according to a third embodiment.

FIG. 9 is an explanatory diagram of a relay drive circuit of an NCU according to a fourth embodiment.

FIG. 10 is a schematic configuration diagram of a conventional no-ringing data communication system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Host apparatus 2 Center side network controller (C-NCU) 3, 4 switching center (LS) 5 No ringing trunk (NRT) 6 Terminal network controller (NCU) 7, 8 terminals 9 Home telephone 10,11 Connection line 12, 14 Telephone line 13 Inter-station trunk line 61 Rectifier circuit 62 Insulation resistance 63 Power supply capacitor 64 Zener diode (constant voltage circuit) 66 High-speed charging circuit 67 Power circuit for call communication (off-hook control circuit) 70 CPU circuit (main control circuit) 71 Charge control circuit 72 PB transmission / reception circuit 73 Modem 74 Non-volatile memory (EEPROM) 75 Telephone disconnection circuit 77 Off hook detection circuit 79 Meter interface circuit 80 Polarity detection circuit 81 Ringer use charging circuit 82 Reset circuit

Claims (13)

[Claims] 1. A terminal network control device for performing data transmission with a center device using a telephone line, comprising: an insulation resistor for taking in power from the telephone line; and each circuit of the terminal network control device charged through the insulation resistor. A power supply capacitor for supplying power, and a high-speed charging circuit connected in parallel with the insulation resistance and capable of charging the power supply capacitor at high speed, wherein the high-speed charging circuit is in a completely discharged state of the capacitor. A terminal network control device capable of high-speed charging until the minimum voltage at which the terminal network control device can operate normally. 2. The insulation resistance is a sum of a line voltage of 48 V, an operating current when the terminal network control device is in a standby state, and an increase in a future leakage current predicted by a product life of the power supply capacitor. 2. The terminal network control device according to claim 1, wherein the current value of the terminal network control device is set to a value of 1 M.OMEGA. 3. The high-speed charging circuit includes a transistor and a resistor connected to short-circuit the insulation resistor, and a Zener diode connected to a base of the transistor, and the emitter of the transistor has a Zener diode. 2. The terminal network control device according to claim 1, wherein when the voltage becomes lower than the Zener voltage, the transistor is turned on, the insulation resistance is short-circuited, and the power supply capacitor can be charged via the resistance. 4. The terminal network control device according to claim 3, wherein a resistance value is set such that a current value charged by the high-speed charging circuit is equal to or less than a loop current value at which the central office exchange detects a line capture. . 5. A terminal network control device for transmitting data to and from a center device using a telephone line, comprising: an insulation resistor for taking in power from the telephone line; and each circuit of the terminal network control device charged through the insulation resistor. A power supply capacitor for supplying electric power, a two-stage charging circuit for charging the capacitor is provided, and the first charging circuit operates to a minimum voltage value at which the main control circuit can operate. The second charging circuit is connected in parallel with the insulation resistance so as to be chargeable at a loop current or less, and the second charging circuit detects a loop control circuit that captures and controls a telephone line, and detects the lowest voltage at which the main control circuit can operate, and starts operation. A low-voltage detection circuit, a charging control circuit that controls the loop control circuit based on the output of the low-voltage detection circuit, and a battery that continues charging for a predetermined time after the low-voltage detection circuit is turned off. A terminal network control device comprising a charge control capacitor having a time constant so that a charge control circuit can operate. 6. After the charging of the power supply capacitor has been completed and the initialization of the main control circuit has been completed, a terminal call is made to continuously operate to transmit the completion of initialization to the center device, 2. The terminal network control device according to claim 1, further comprising a non-volatile memory capable of storing a telephone number necessary for calling the terminal, the terminal network control device transmitting predetermined information to and from the device. 7. The terminal network control device according to claim 6, wherein the initial telephone number is written in the nonvolatile memory during the production process as a unique telephone number such as for each shipping area. 8. A terminal network control device for performing data transmission with a center device using a telephone line, comprising: a power supply capacitor for supplying power to each circuit of the terminal network control device; A terminal network control device in which connection terminals are provided at both end circuits of the power supply capacitor to enable high-speed charging of the power supply capacitor manually from a battery or the like during initial construction. 9. A power supply capacitor for supplying power to each circuit of a terminal network control device in a terminal network control device for performing data transmission with a center side device using a telephone line, and a power supply capacitor for supplying power to each circuit of the terminal network control device. A ringer-based charging circuit for charging a capacitor is provided. The ringer-based charging circuit rectifies an AC signal and a capacitor that cuts a DC voltage of a telephone line, a resistor that satisfies an AC impedance at the time of ringer input. A terminal network control device comprising: a rectifier circuit; and two zener diodes that allow a ringer voltage of 60 V or more to flow, and charges the power supply capacitor via a resistor to a voltage of 60 V or more when a ringer is input. 10. A telephone disconnection circuit is provided between a line terminal and a telephone connection terminal. After installation work is completed, the telephone is disconnected and a user's home is called from a mobile phone or the like, and power is supplied from the ringer-based charging circuit. 10. The terminal network control device according to claim 9, wherein the terminal capacitor is charged. 11. A terminal network control device including a meter interface circuit separated from a telephone line by an optical coupling element, wherein the meter interface circuit includes a drive circuit and a pulse transformer on a main control circuit side, and a meter transformer circuit on a meter side. A power supply capacitor is provided, and the power supply system on the main control circuit side is configured to charge the capacitor on the meter side via a drive circuit and a pulse transformer, and the terminal network control device and the meter are connected by an optical coupling element and a pulse transformer. Terminal network control device that is electrically insulated. 12. The drive circuit includes two types of capacitors and a transistor for switching the capacitors, and a drive signal is configured to be operable in two modes, intermittent and continuous. 12. The apparatus according to claim 11, wherein when the current consumption of the circuit needs to be reduced in the standby state, the operation is performed intermittently with a low-capacitance capacitor when the current consumption is large, and when the large current consumption such as communication with a meter is performed, the operation is continuously performed with the large-capacity capacitor. Terminal network controller. 13. A terminal network control device for performing data transmission with a center device using a telephone line, comprising: a power supply capacitor for supplying power to each circuit of the terminal network control device; A low-voltage detection circuit for detecting a voltage, wherein the low-voltage detection circuit has a detection level equal to or higher than a voltage at which a reset-side coil that conducts a connection terminal of the telephone can be driven, and the main control circuit is disabled. A terminal network control device which is set to be equal to or lower than a falling voltage and independently drives the reset coil independently of the operation of the main control circuit.