JPS6035312Y2 - memory control circuit - Google Patents

Description

[Detailed explanation of the invention] The present invention aims to improve the reliability of the storage control circuit, more specifically, the signal transmission system.
The present invention relates to a storage control circuit used for switching in an automatic switching backup type device in which one or more backup circuits are provided.

In a system using the automatic switching backup system, when the possibility of an accident is detected due to a decrease in the pilot current in the working circuit (hereinafter referred to as an alarm), the signal switching device switches the state connected to the backup system to the previous stage system. Is it due to a disability?
In order to determine whether a failure is caused by a single device failure, it is determined whether the backup circuit generates an alarm within a certain period of time after the current circuit is switched to the backup circuit.

If the standby circuit becomes alarmed within a certain period of time, it is assumed that there is a failure in the previous stage system, the state is stored, and the priority of switching is kept low compared to other switching.

Conventionally, the memory control circuit used in the above system individually detects various conditions such as alarm detection and signal switching, controls logic circuits made of transistors, ICs, etc., drives memory elements such as magnetic valves, and controls memory. However, the stored information was converted using transistors, ICs, etc. to perform switching control.

This has the disadvantage of complicating the circuit.

An object of the present invention is to provide a storage control circuit that can control storage with a simple configuration.

In order to further achieve the above object, the storage control circuit according to the present invention is provided with one or more backup transmission circuits for a plurality of active transmission circuits in order to improve the reliability of the signal transmission system, and to prevent failures in the active transmission circuits. In a storage control circuit used in an automatic switching backup type device that automatically switches to the backup transmission circuit when the backup transmission occurs, the output of the alarm circuit 1 of the backup transmission circuit is connected to the relay contact of the signal switch via the capacitor 7. The make side of the relay contact 14 is connected to the relay 9 of the memory circuit, and the break side of the relay contact 14 is connected to the connection point between the output of the alarm circuit 1 and the capacitor 7 via a resistor. , or the break side of the relay contact 14 is connected to the relay 9 of the memory circuit, and the break side of the relay contact 14 is connected to the relay 9 of the memory circuit.
The meter side is connected to the output of the alarm circuit 1 and the capacitor 7.
The output of the alarm circuit 2 of the current transmission circuit is connected to the relay 9 through a contact point which is shorted when the relay 9 of the memory circuit is activated.

According to the above configuration, the relationship between the alarm circuit of the active transmission circuit and the alarm circuit of the standby transmission circuit within a certain period of time after the signal switching device operates can be stored.

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

The figure is a circuit diagram showing an embodiment of a storage control circuit according to the present invention.

In the figure, 1 indicates an alarm detection circuit of the backup transmission circuit, 2 indicates an alarm detection circuit of the active transmission circuit, 3 indicates a relay circuit that operates in parallel with the signal switching relay of the signal switch, and 4 indicates the storage section of the storage control circuit. .

Similar to this figure, the storage control circuits connected to the alarm circuits of other active transmission circuits have the same configuration, and are connected in parallel to the alarm detection circuits of the backup transmission circuits.

If the relay RLI of the backup transmission circuit 1 operates within a certain period of time after the relay RL2 of the alarm detection circuit 2 of the active transmission circuit operates, the storage control circuit considers it to be a failure of the previous stage system and sets the switching priority to low. If another active transmission circuit goes into an alarm state due to a high-priority failure, such as a failure in the vehicle body, switching control is performed so that relief can be given to the standby transmission circuit with priority.

In other words, when the current transmission circuit has a failure, relay RL2 of alarm detection circuit 2 operates, and air is generated from relay contact r12 and sent to relay contact r14 of the memory circuit, but in this state, RL4 is not operating. Because there is no earth qi is r1
It is blocked by 4.

Next, the relay of the relay circuit 3 is driven via another relay contact (not shown) of the alarm detection circuit 2, and the working transmission circuit is connected to the backup transmission circuit.

After connecting to the backup transmission circuit, the alarm detection circuit 1 detects the harmfulness of the failure in the backup transmission circuit.

If the backup transmission circuit also has an alarm, RLl is activated and air is transmitted through the relay contact rll to capacitors C1 and RL3.
The memory circuit relay RL4 is operated through the relay contact r13 of the memory circuit for only a period of time determined by the relationship between the impedances of cl and RL4.

At this time, if alarm circuit 2 remains in alarm, r
Earth air is applied to RL4 through 14 relay contacts, r
Even if the ground pulse that operated RL4 via ll, cl, and r13 disappears due to charging of the capacitor, RL2
If the alarm remains, RL4 remains activated.

When sending the switching response information of the signal switching device to another active floor; as the switching stop information of the signal switching device of the transmission circuit, the RL
The signal is sent out through another relay contact (not shown) of RL4, which is opened during operation.

The switching response information is, for example, after the relay RL2 of the alarm detection circuit 2 is activated, the active transmission circuit is switched to the standby transmission circuit.
This refers to information sent to confirm that the connection has been made, and is used as switching stop information as described above.

Specifically, the switching stop information indicates that relay RL2 of alarm detection circuit 2 is operating and relay RL4 of storage unit 4
If the IrRL4 is not operating, the information is sent out through other relay contacts (not shown) of IrRL4, and if another working transmission line becomes an alarm, the working transmission circuit can be rescued by the standby transmission circuit. This is the information that does not apply.

Therefore, if an alarm occurs in another current circuit while memory circuit RL4 is operating, the signal switch of the other current circuit will operate, and RL3 will become inactive because the other signal switch will give switching stop information. Become.

At this time, CI and R1 are connected via relay contact r13, and the charge of C1 is discharged, so that the time constant when CI is charged at the next switching time becomes constant.

As described above, the storage control circuit according to the present invention has the advantage of simplifying the circuit by realizing a complex logic circuit, storage circuit, and control circuit just by combining relays, capacitors, and resistors.

[Brief explanation of the drawing]

The figure is a circuit diagram showing an embodiment of the storage control circuit according to the present invention. DESCRIPTION OF SYMBOLS 1... Alarm detection section of the backup transmission line, 2... Alarm detection section of the music transmission line, 3. Relay circuit operating in parallel with the signal switching relay of the song/signal switch, 4...・
...Storage unit, 5, 9, 11.13...Relay,
6.10,12.14...Relay contact, 7...
... Capacitor, 8... Resistor.

Claims (1)

[Scope of utility model registration request] In order to improve the reliability of the signal transmission system, one or more backup transmission circuits are provided for a plurality of working transmission circuits, and automatic switching automatically switches to the backup transmission circuit when a failure occurs in the working transmission circuit. In a storage control circuit used in a standby system device, the output of the alarm circuit 1 of the standby transmission circuit is connected to the common part of the relay contact 14 of the signal switch via the capacitor 7, and the make side of the relay contact 14 is connected to the common part of the relay contact 14 of the signal switch. is connected to the relay 9 of the memory circuit, and the break side of the relay contact 14 is connected to the connection point between the output of the alarm circuit 1 and the capacitor 7 via a resistor, or the break side of the relay contact 14 is connected to the relay 9 of the memory circuit. The make side of the relay contact 14 is connected to the connection point between the output of the alarm circuit 1 and the capacitor 7 via a resistor, and the output of the alarm circuit 2 of the current transmission circuit is connected to the relay 9 of the storage circuit. A memory control circuit configured by connecting to the relay 9 via contacts that sometimes short-circuit.