JPS6015175B2 - remote control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for remotely controlling an intermediate equalizer, etc. in wired communication in which signals are transmitted through a cable.

More generally, the present invention relates to remote control of switch circuits through power supply lines. Multi-repeater wired transmission systems are constructed by inserting repeaters with gain characteristics equal to the loss characteristics occurring in the transmission cable into the cable at regular intervals, but there is a difference between the loss characteristics of the cable and the gain characteristics of the repeaters. There are slight deviations, which accumulate as the number of relays increases.

In order to compensate for such accumulated deviations, a method of inserting an equalizer every several to several dozen repeating sections is widely used. When this equalizer is installed in a manned station or in an operable location such as an unmanned hut on the ground, the operator can measure its characteristics and set it optimally. When the equalizer is buried with underground cables or laid on the seabed with submarine cables, people cannot directly touch and operate the equalizer. For this reason,
In conventional systems, the characteristics of the equalizer are predicted immediately before installation, and adjustments are made to optimize them when the entire relay transmission line has been installed, and are generally configured so that no changes can be made after installation. . However, fluctuations may occur due to unpredictable factors, and a method that allows the equalizer to be adjusted after the entire installation is completed is desired. The applicant disclosed a new method for this purpose in Tokubuta No. 52-24973.

This is a system that temporarily applies a current in the opposite direction to the normal power supply current to the power supply line that supplies power to the repeater, and controls the characteristics of the equalizer using a switch circuit that senses this reverse direction current. be. This method allows remote control of the equalizer without the need for special control lines, and has an excellent feature. It has drawbacks such as having a negative effect on electrolytic capacitors and other circuit elements inside the device. The present invention is configured such that a power supply line passes through a remotely located controlled device (for example, an equalizer), and includes means for controlling the power supply voltage of the power supply line at an operating end (for example, a terminal station), A remote control system is applied to the controlled device, which includes circuit means that operates according to the voltage of the power supply line.

The present invention is characterized in that the circuit means includes a first zener diode inserted in series in the power supply path, and a first zener diode in parallel with the first zener diode with the same polarity as the first zener diode in parentheses. a second zener diode which is connected and has a lower zener voltage than the first zener diode; a switch circuit which is connected in series with the second zener diode and performs switching control in which stepping is performed by intermittent current passing through the second zener diode; and the second zener diode. a first resistor further connected in series with the zener diode and the switch circuit;
The means for controlling the power supply voltage includes the second Zener diode and a second resistor connected in parallel to the switch circuit, and in a normal power supply state, the power supply voltage is connected to the first Zener diode. means for setting the voltage to a voltage that is opposite to the conduction direction of the zener diode and exceeds the zener voltage; means for repeatedly applying a voltage that exceeds the zener voltage of the second zener diode and a voltage that is less than the zener voltage; It is in a place that includes.

A plurality of controlled devices are connected in series to one power supply path, and the values of the first and second resistors are set to different values for each controlled device. The controllers can be configured to be individually controlled.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a diagram showing an example of the configuration of a wired transmission relay system.

1 and 2 are terminal stations, and the two terminal stations are connected by a cable 3 to perform wired transmission.

Repeaters 4 are inserted into the cable 3 at approximately equal intervals,
The transmission signal loss occurring in the cable 3 is amplified and compensated. Reference numeral 5 denotes an equalizer, in which a variable equalization network is incorporated, and is designed to compensate for the cumulative residual of slight deviations between the loss of each cable 3 and the gain of each repeater 4. has been completed.

Since each repeater 4 is equipped with an amplifier, a power source is required to drive the amplifier, and this is superimposed on the same cable 3 as the signal and sent from the terminal station 1. That is, terminal station 1
Then, the signal is sent from terminal T to cable 3 via capacitor C.
The power supply B is coupled to the same cable 3 via a choke coil L. Similarly, in each repeater 4, the signal and power supply are separated and connected by a similar separation circuit. In general, in recent systems where the amplifier of the repeater 4 is a transistor amplifier, the power supply circuits of each repeater 4 are all connected in series, and the power supply B of the terminal station 1 supplies a fairly high voltage direct current with a constant current. A common method is to control and transmit the signal so that the

In the example of FIG. 1, the return path of the power supply current from terminal station 2 to terminal station 1 is grounded. In the relay system configured as described above, the equalizer 5 is generally a passive circuit, so the conventional system is configured such that the power supply is separated and the input and output are simply directly connected.

FIG. 2 is a circuit diagram of an embodiment of the present invention.

FIG. 2 shows the power supply circuit of the equalizer 5 in particular detail, and the waveform filter for separating the power and the communication signal and the communication signal circuit are omitted. That is, in the circuit of the present invention, the input and output of the power source are coupled via the Zener diode D, without simply connecting the power source circuit directly. A series circuit of resistors R and R2 is connected in parallel to this Zener diode D, and the resistors R and R2 are connected in parallel to each other.
A switch circuit S is connected from the connection point of the zener diode D to one end of the zener diode D, via the zener diode D2. S
is, for example, a relay winding. In Figure 2, the dash on the right (
Similar circuits marked with ') indicate that a plurality of equalizers 5 are inserted into the same line.

Letting the zener voltages of zener diodes D and D2 be Vo, Vo2, respectively, V.

It is preferable to select each Zener diode so that 2<VD.

Also, regarding the resistors R,, R2, R. It is preferable that <R2.

To explain the operation of the circuit constructed in this way, a DC power supply is now connected to terminal 11 according to the polarity indication, and the voltage of the DC power supply is gradually increased from zero.

The suitability of terminal 11 is equal to the direction of power supply to repeater 4. As soon as voltage appears on the DC power supply, resistors R, and R2
A current flows through. At this time, Zener diodes D and D2
is not suitable for guiding. This is called "state 1".
When the DC voltage at terminal 11 is further increased, Zener diode D2 becomes conductive, and current flows through switch circuit S.
This is called "state 0". When the DC voltage is further increased, the zener diode D. is deviated.

This is called "state m". The state in which the power supplies necessary to operate each repeater 4 are connected is set to be this "state m." In each of these operating states, when the power supply voltage is changed so as to alternate between "state 1" and "state 0", the switch circuit S repeats intermittent operation.

If the switch circuit S is constituted by a start-stop type relay, the contact steps of the start-stop type relay are sequentially advanced by repeating the intermittent operation.

A similar operation can also be realized not by a mechanical dovetail but by a counter and an electronic switch configured by an electronic circuit. Next, considering the control of another equalizer inserted in the same line, the zener diode D,′,
Regarding the zener voltage VD,', VD2' of D2', Vo,
=Vo,'VD2=VD2', resistor R,,
Also for R,′,R2,R2′, R,=R,′,R
By setting 2=R2', both equalizers can be controlled simultaneously.

In addition, when controlling this separately, resistors R,,R
This can be done arbitrarily by appropriately selecting the values of 2, R,', and R2'. For example, R. <R,', R2Z
R2', if the power supply voltage is gradually increased, one equalizer will initially change from "state 1" to "state 0".
'', and then the other equalizer transitions from ``state 1'' to ``state LOW''.

Even when connecting more equalizers, each equalizer can be set to operate in sequence by appropriately determining the value of the resistor. Therefore, each equalizer can be individually remotely controlled by controlling the power supply voltage. In addition to this, if the zener voltage of the zener diode is changed and selected, the operating voltage range can be set quite freely. Furthermore, in the method of the present invention,
When the power supply to the repeater is started or stopped, each equalizer may history the above-mentioned "state 1" to "state 0" and the equalizer settings may change, but this can be done by switching the switch in several ways. The operation of the circuit can be avoided.

One method is to equip each switch circuit S with a time constant circuit to distinguish between sudden and gradual changes in the power supply voltage, and to set the switch circuit S so that it does not operate during either of them. be. For example, the voltage can be differentiated by changing the voltage slowly when controlling the equalizer and changing it rapidly when starting or stopping power supply. Second, this adjustment must be made again each time power supply is started or stopped. The third method is to lock the operation of the switch circuit S by using another switch operation using some method, such as a time-lapse switch. As described above, according to the present invention, it is possible to remotely control the equalizer through the power supply line of the repeater, and furthermore, it is possible to perform remote control without changing the polarity of the power supply. There is no window effect on the circuit elements of the device. Note that the technology of the present invention can be used not only as a wired transmission method but also as a remote control method using a power supply line.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the configuration of a wired transmission relay system. FIG. 2 is a circuit diagram of an embodiment of the present invention. 1, 2... terminal station, 3... cable, 4... repeater, 5...
...Equalizer. cum 1 figure 2 figure

Claims (1)

[Scope of Claims] 1. A power supply line is configured such that a power supply line passes through a remotely located controlled device, and an operating end is provided with means for controlling a power supply voltage of the power supply line, and the controlled device is connected to the power supply line. In a remote control system, the circuit means includes a first zener diode inserted in series in the power supply line, and a first zener diode connected in parallel to the first zener diode. , and a second Zener diode that is connected to the same polarity as this first Zener diode and has a lower Zener voltage than this first Zener diode, and is connected in series to this second Zener diode and passes through it. a switch circuit in which switching control is performed in steps by intermittent current; a first resistor further connected in series with the second Zener diode and the switch circuit; the second Zener diode and the switch circuit; and a second resistor connected in parallel to the switch circuit, and the means for controlling the power supply voltage is configured to direct the power supply voltage in the conducting direction to the first zener diode in a normal power supply state. means for setting a voltage in the opposite direction to a voltage that exceeds the zener voltage; and in a state where the switch circuit is controlled, the power supply voltage is set to a voltage in the conduction direction of the first zener diode. and a voltage in the opposite direction to the second zener diode, which is a voltage lower than the zener voltage, and is characterized by comprising means for repeatedly applying a voltage exceeding the zener voltage of the second zener diode and a voltage lower than the zener voltage of the second zener diode. Remote control method. 2. The remote control system according to claim 1, wherein the controlled device is an equalizer of a multi-relay wired transmission system, and the switch circuit is a circuit that switches the equalization circuit of this equalizer. 3. A patent claim in which there are a plurality of controlled devices, the plurality of controlled devices are connected in series to one power supply path, and the values of the first and second resistors are set to different values for each controlled device. The remote control device according to item 1.