JPS5856295B2 - Power-on control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power-on system, particularly when each power source in a plurality of communication devices forming a ring-shaped communication network is connected to a mutually shared ring-shaped power supply line. , any one
Power-on control that controls (2) to automatically turn on the power of each communication device by detecting the rise of the power supply voltage applied to the power supply line that occurs as a result of turning on the power of the two communication devices □ □ Regarding the method.

When multiple communication devices communicate with each other, rather than constructing a mesh-like communication path that connects each communication device to each other, it is preferable to connect each communication device in a ring with a loop-shaped transmission path. It is cheaper to provide data-by-way.

In such a case, as shown in FIG.
1. N2...Nn repeaters are arranged in a loop and connected by a transmission line 1 to form a loop transmission line.

In this case, if even one of the plurality of repeaters stops working due to a power failure, for example, the entire system will stop functioning.

Therefore, even if a power failure occurs in a repeater, a so-called distributed power supply system is adopted, in which power is supplied from adjacent communication devices.

For example, if a power failure occurs in the communication device N2 and the power supply to the relay is stopped, the relays of the communication devices N1 and N3 are configured to supply power to the relay of the communication device N2.

Furthermore, the communication devices N2 and N4 are configured to supply power to the communication device N3.

In this way, the communication devices N1 to Nn can supply power to each other.

Therefore, even if a power failure occurs in the communication device due to some reason, the ring-shaped transmission line 1 can continue to operate without going down.

However, in conventional devices of this kind, the power supply voltage feed line 2
Since the repeaters are connected in parallel to each other, when the power is first turned on to the system, all the repeaters are connected to the power that is turned on first. Therefore, it is necessary to prevent such an overload condition.

Therefore, control lines and control signals were used to prevent such a large number of repeaters from being connected to the initially turned on power supply.

Therefore, a special signal line and signal voltage are required, resulting in a disadvantage that the system configuration becomes complicated.

Therefore, an object of the present invention is to provide a power-on side (goods) system that improves such problems, and for this purpose, in the power-on side (goods) system of the present invention, a ring-shaped communication network is formed by a plurality of communication devices. In a power supply circuit device in which a power supply device of each of the above-mentioned communication devices is connected in parallel to a power supply line, a repeater is supplied with power by the power supply device, and a power supply voltage riser that detects the rise of the power supply voltage applied to the above-mentioned power supply line. The present invention is characterized in that a detection means is provided, and the power supply for the repeater is turned on by the power supply voltage rise detection means when the power supply voltage is first applied to the power supply line.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

Fig. 2 is a connection diagram of the power supply unit, repeater, and power supply line that constitute the communication device N, Fig. 3 is an explanatory diagram of the power supply section and each side (goods) circuit inside the power supply unit, and Fig. 4 is the invention of the present invention. FIG.

In the figure, 3 is a repeater, 4 is a power supply unit, 5 is a power supply section, R
Ll is a power supply voltage detection relay, RL2 is a disconnection relay that connects and disconnects the repeater 3 and the power supply line, RL3 is a power-on relay for the power supply unit 5, RL is an output voltage detection relay for the power supply unit 5, and S is a turning contact of the power supply unit 5, and MR is a meter relay that operates with a known voltage.

Repeaters 3 of communication devices N1 to Nn are arranged on the transmission line 1, and the repeaters 3, . . . are connected in series to form a loop-shaped transmission line 1, thus forming a highway.

The power supply line 2 that feeds power to the repeater 3 is 2-1 and 2-2.
It is composed of book lines.

A contact rllB of a disconnecting relay RL2 is provided between the repeater 3 and the line 2-1, and when the contact rA2 is closed, the repeater 3 is supplied with power from the line 2-1.2-2. It is configured so that it can be received.

As shown in FIG. 3, the power supply unit 4 is provided with a power supply section 5, a disconnection relay RL2, a power-on relay RL3, an output voltage detection relay RL4, and the like.

The power-on contact S is connected by means such as an electromagnetic device (not shown) that operates when the power-on relay RL3 operates.
It is indirectly controlled by the power-on relay RL3, and is also connected in parallel with a power-on switch, etc. (not shown).

Now, on the data highway shown in FIG. 1, in order to put the loop-shaped transmission line 1 into an operating state, for example, a power-on switch in the communication device N1 is turned on at time t1 in FIG. 4.

Therefore, the power supply voltage increases in the power supply line 2 as shown in FIG. 4A.

Then, at time t3, the power supply voltage detection relay RL1 of another communication device operates to close its contact r11.

By closing the contact r11, the power-on relay RL3 operates because a charging current flows into the capacitor C, and indirectly closes the power-on contact S as described above at time t3.

As a result, an alternating current voltage is applied to the power supply unit 5.

The capacitance of the capacitor C is selected to have a time constant corresponding to the time it takes for the contact S to reliably close due to the operation of the power-on relay RL3.

On the other hand, when the contact r14 is closed, the disconnection relay RL2 is energized by the power source (2) in the power supply unit 4, and maintains the contact r13 in an open state.

Therefore, at time t1 when the power switch is first turned on in the communication device N1, the repeater 3 is disconnected from the line 2-1.

Therefore, when a power supply voltage is generated on the power supply line 2, each repeater 3 is disconnected from the power supply line 2, so load current is supplied from the power supply line 2 to each repeater 3, and power supply starts first. There is no danger that the power supply section of the communication device N1 becomes overloaded.

Then, at time t4, the DC output voltage of the power supply unit 5 becomes ready to supply power to the repeater 3 of its own station.

At this time, the output voltage detection relay RL operates to open its contact r14.

Thus, the connection/disconnection relay RL2 becomes inactive, and its contact rl12 returns to the closed state at time t.

Therefore, after time t5, the repeater 3 is connected to the line 2-1, so that the repeater 3 can also be supplied with power from the power supply line 2.

Therefore, after time t5, if a failure or the like occurs in the power supply unit 5 and the repeater 3 is no longer able to receive power from its own power supply unit 5, power will be supplied from the power supply line 2.

Then, when time t5 has passed, each communication device N1 to Nn
If the power supply section is operating normally, the voltage between wires 2-1 and 2-2 that make up the power supply line 2 will reach the specified value, and the meter will relay MR
You can know this by

If a short-circuit failure occurs in a power supply section that supplies load current to a certain repeater, for example, power supply section 5, and the load becomes larger than normal,
The power supply section of the adjacent communication device may be overloaded accordingly.

In order to protect other normal power supplies in such cases, the power supply section of each communication device generally has a drooping characteristic.
In such a case, the voltage between the lines 2-1 and 2-2 does not reach the specified value, and the meter relay MR generates an alarm, notifying the power supply section that a failure has occurred.

As a result, the power supply section of each communication device can be turned on by appropriate means.
For example, maintenance personnel will investigate.

When turning off the power to the repeater 3, the power-on contact S is opened by an appropriate means.

As a result, the DC output voltage of the power supply unit 5 gradually decreases, and the output voltage detection relay RL4 first returns to the non-operating state,
The contact r14 is closed.

As a result, the contact relay RL2 becomes operational again and opens the contact rl12.

Thus, the repeater 3 connects the lines 2-1.
The power supply from 2-2 will also be cut off.

In this way, each of the communication devices N1 to Nn can be powered off.

In the above explanation, a time-limited relay circuit including the power supply voltage detection relay RL1 and the power supply relay RL3 connected to the capacitor C was used as the power supply voltage rise detection means, but it is of course not limited to this. For example, there is also a method using a sequential counter.

In addition, we have explained an example in which a specified meter relay that operates with a known voltage is used as a means of measuring the above-mentioned power supply voltage after a certain period of time from when the power supply voltage is first applied to the power supply line, but of course it is limited to this only. Of course, it is also possible to use other means.

The above description is just an example, and the present invention should not be limited thereto.

As described above, according to the present invention, it is possible to sequentially turn on power supply circuits configured in a ring shape without using special signal lines or signal circuits.

Moreover, since each power supply circuit is turned on by detecting the rising voltage of the power supply line, it is possible to open the contact r12, which is the circuit connection means between the power supply line and the repeater, when the power is cut off, and the power supply The cutting operation can be performed reliably.

Moreover, by providing the circuit connection means, it is possible to turn on the power for the first time while the circuit is in the OFF state, so that the power supply voltage is applied to the power supply line with the high impedance power supply voltage detection relay connected. Therefore, there is no need for the power supply unit to share a load greater than the distributed power supply capacity.

Another advantage is that it is possible to determine whether the highway is usable by detecting the power supply line voltage after the time has elapsed until all communication devices have been powered on and checking whether it is within the specified range. be.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a loop-shaped transmission path, Fig. 2 is a connection diagram of a power supply unit, a repeater, and a power supply line in an embodiment of the present invention, and Fig. 3 is a diagram showing the power supply section inside the power supply unit and each side ( Figure 4 is an explanatory diagram of the operation of the present invention. In the figure, 1 is a transmission path, 2 is a power supply line, 3 is a repeater, 4 is a power supply unit, 5 is a power supply section, N1 to Nn are communication devices, RL
, is a power supply voltage detection relay, RL2 is a disconnection relay that connects and disconnects the repeater 3 and the power supply line, RL3 is a power-on relay for the power supply section 5, RL4 is an output voltage detection relay of the power supply section 5, and S is a relay for detecting the output voltage of the power supply section 5. The closing contact of the power supply section 5, MR, indicates a meter relay that operates with a specified voltage, respectively.

Claims (1)

[Scope of Claims] 1. In a power supply circuit device in which a plurality of communication devices form a ring-shaped communication network and power supply devices of each of the above communication devices are connected in parallel to a power supply line, a repeater and a repeater supplied with power by the above power supply device are provided. , a power supply voltage rise detection means for detecting a rise of the power supply voltage applied to the power supply line is provided, and when the power supply voltage is first applied to the power supply line, the power supply for the repeater is turned on by the power supply voltage rise detection means. The power-on side (goods) method is characterized by controlling as follows. 2 Providing a circuit connection means between the above-mentioned power supply line and the repeater,
The circuit connecting means is controlled to be closed when an initial voltage applied to the power supply line is detected and the output of the power supply device of the load becomes capable of supplying power to the power supply line. A power-on control method according to claim 1.