JPS6015174B2 - 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. The multi-mode continuous wired transmission system is constructed by inserting repeaters with gain characteristics equal to the loss characteristics generated in the transmission cable into the cable at regular intervals, but the difference between the cable loss characteristics and the repeater gain characteristics is There is a slight deviation in the number of relays, and this accumulates 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 methods, 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, so that no changes can be made after installation. is common. 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 Samurai Gaku Sho 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 improves on this by providing a method for remotely controlling the equalizer through the feed line of the repeater, and which does not require reversing the direction of the feed current from the normal direction. purpose.

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 parentheses in parallel with the first zener diode. a second zener diode connected to the same polarity and having a lower zener voltage than the first zener diode;
This second zener diode is connected in series with a switching circuit that performs switching control that advances as the current continues to pass through. The first zener above
means for setting a voltage that is applied to the diode in a direction opposite to its conduction direction and exceeding the zener voltage; and in a state where the switch circuit is controlled, the fin source voltage is set to A voltage in the opposite direction in the conduction direction of the zener diode, which is less than the zener voltage, and which exceeds the zener voltage of the second zener diode, and a voltage equal to the zener voltage are repeatedly applied to the zener diode. It includes the means.

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 to amplify and compensate for transmission signal loss occurring in the cable 3. Reference numeral 5 denotes an equalizer, in which a variable equalization network is incorporated, and is configured 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 done.

Since each repeater 4 is equipped with an amplifier, a power source is required to drive it, and this is superimposed on the same cable 3 as the signal and sent from the general 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. In each repeater 4, the signal and power supply are separated and connected to the same machine 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 switch circuit S is connected in parallel with this Zener diode D, via a Zener diode D2. Further, a resistor R is connected in parallel with the Zener diode D. Letting the zener voltages of zener diodes D and D2 be VD, Vo2, respectively, V.

2nd Vo・ is set to be.

A similar circuit shown with a dash (') on the right in FIG. 2 indicates that a plurality of equalizers 5 are inserted into the same line.

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 polarity of terminal 11 is equal to the power supply direction to repeater 4 . As soon as a voltage appears on the DC power supply, a current flows through the resistor R,. At this time, Zener diodes D and D2 are not electrically connected. This is called "state 1". When the DC voltage at terminal 11 is further increased, the zener diode D
2 becomes conductive, and current flows through the switch circuit S.

This is called "state ro". When the DC voltage is further increased, a zener diode D becomes suitable.

This is called "state m". The state in which power necessary for operating each repeater 4 is supplied is set to be this "state m." In each such operating state, “state 1
If the power supply voltage is changed so as to go back and forth between "state n" and "state n," the switch circuit S will repeat the 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 by a counter and an electronic switch configured by electronic circuits instead of mechanical contacts. Next, considering the control of another equalizer inserted in the same line, the zener diode D,′,
V for the zener voltage VD,', VD2' of D2'.

,=VD,'V. If we set 2'=VD2',
Both equalizers can be controlled simultaneously.

In addition, when controlling this separately, for example, Vo2<
Vo. The zener voltage may be selected such that <Vo2'<Vo,'.

In this case, when the power supply voltage is gradually increased, one equalizer first changes from "state 0" to "state m",
The other equalizer then transitions from "state 1" to "state 0." Even if more equalizers are connected, it is likewise possible to control them separately or simultaneously, or only a portion thereof, depending on the selection of Zener diodes. In the circuit of FIG. 2, the resistor R is required when a plurality of equalizers are inserted, but is not necessarily required when only one equalizer is inserted.

Furthermore, in the method of the present invention, each equalizer may history the above-mentioned "state 1" to "state 0" due to the start or stop of power supply to the repeater, and the settings of the equalizer may change. This can avoid operation of the switch circuit in several ways.

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. Thirdly, the switch circuit S
is to lock the operation of the As described above, according to the present invention, it is possible to remotely control the equalizer through the power supply path of the repeater, and furthermore, it is possible to remotely control the equalizer without changing the polarity of the power supply. There is no adverse effect on circuit elements. 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. Ken 1 Zufune 2

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 the 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 and passes through this second Zener diode. The means for controlling the power supply voltage is provided with a switch circuit that performs switching control in steps by intermittent current, and the means for controlling the power supply voltage is configured to control the power supply voltage in the conduction direction of the first zener diode in the normal power supply state. means for setting the voltage to a voltage that is applied in the opposite direction to the zener diode and exceeds the zener voltage; a voltage in a direction that is lower than the zener voltage, and includes 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. method. 2. The remote control method according to claim 1, wherein the controlled device is an equalizer using a multi-channel continuous wired transmission method, and the switch circuit is a circuit that switches the equalization circuit of this equalizer.