JPH05189261A - Active/spare switching device - Google Patents

Abstract

PURPOSE:To improve the easiness of maintenance, etc. CONSTITUTION:Since electrostatic capacity to determine the time constant of an active unit 1 is determined by only a capacitor 4, and in a spare unit 11, it is determined by the sum of the capacitors 14, 15, the time constant of the active unit 1 is shorter, and since a reset circuit 3 stops outputting a reset signal earlier than the reset circuit 13, the output of a NAND gate 2 becomes '0', and the active unit 1 starts up first. Besides, the output of the NAND gate 2 is inputted to the input terminal 18 of the NAND gate 12 through an input/output terminal, and the output of the same NAND gate 12 is kept at '1', and the spare unit 11 stands by. On the other hand, when the active unit 1 is disconnected while the active unit 1 is working, the input terminal 18 of the NAND gate 12 is made '1' by a pull-up resistor 20, and the output of the NAND gate 12 becomes '0', and the spare unit starts up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active spare switching device, and more particularly to an active spare switching device suitable for use in a unitized electronic circuit.

[0002]

2. Description of the Related Art Conventionally, an active spare switching device of this type is shown in FIG. In the figure, a working standby switching device 101 is shown as a working unit (working machine) 108.
And a spare unit (spare machine) 109. In addition, in the active spare switching device 101, a three-terminal NAND gate (hereinafter, simply referred to as a NAND gate) 102 and a two-terminal NAND gate (hereinafter, simply referred to as a NAND gate) whose outputs are connected to one input of each other are provided.
And a NAND gate 102 on one side
A reset circuit 104 that detects a power supply voltage stop for a time constant time corresponding to the capacity of the capacitor 105 and outputs a reset signal is connected to one input of the. And NA
The output of the ND gate 103 is the activation control signal 106 of the standby unit 109, and the output of the NAND gate 102 is the activation control signal 107 of the active unit 108.
The activation control signals 106 and 107 are "0" to indicate activation.

In such a configuration, the active spare switching device 1
When 01, the current unit 108, and the standby unit 109 are turned on at the same time, the output of the reset circuit 104 becomes "0" and the output of the NAND gate 102 becomes "1" due to the voltage drop of the power supply for the time when the capacitor 105 is charged. .. Further, the output of the NAND gate 103 becomes "0".

Since the output of the NAND gate 103 becomes "0", the activation control signal 106 also becomes "0" and the active unit 108 is activated. In addition, the NAND gate 10
Since the output of 2 becomes "1", the activation control signal 107 also becomes "1", and the standby unit 109 is on standby. At the time of failure of each unit 108, 109 or switching by manual operation, the NAND gate 103 or NAN
By inputting a negative pulse to the D gate 102, switching of the working spare is performed.

[0005]

In the above-mentioned conventional working spare switching device, the working unit and the spare unit are separately required, and the working spare switching device cannot have a spare. Therefore, there is a problem in that when the active standby switching device fails, it is not possible to switch between the active and standby, and the entire system is affected. In addition, if the current standby switching device is pulled out for maintenance or the like while the electronic circuit is unitized, both units will be in a standby state, so that there is a problem that it cannot be pulled out easily.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an active spare switching device capable of improving ease of maintenance and the like.

[0007]

In order to achieve the above object, the invention according to claim 1 is an active machine for switching between an active machine and a standby machine in an active spare system including an active machine and a standby machine. A standby switching device currently in use, which is provided in the standby machine, and which has a measuring means for measuring the lapse of a predetermined time from the power-on and a signal indicating the operating condition from the other machine, and after measuring the predetermined time by the measuring means. When the partner machine is not operating, it outputs the signal indicating the operation of the partner machine to the partner machine and, conversely, when the partner machine is running after the measurement of the predetermined time by the measuring means, the partner machine And an operation control means for outputting a signal indicating the non-operation of the own machine to the other machine, and a measurement time extending means for lengthening the measurement time of the measuring means when selected as a standby machine Are you.

The invention according to claim 2 is the same as claim 1
In the active standby switching device described in (1), the operation control means is provided with operation status recognition means for recognizing that the partner machine is inactive when a signal indicating the operation status from the partner machine is not input. It is as a configuration.

[0009]

In the invention according to claim 1 configured as described above, in the working machine and the standby machine, the measuring means measures the elapse of a predetermined time after the power is turned on, and at this time, the measuring time in the standby machine. Since the extending means is selected as the standby machine, the measuring time of the measuring means is lengthened. Then, in the working machine and the standby machine, the operation control means mutually outputs a signal indicating non-operation to the other machine during the measurement time of the measuring means.

In the working machine, the measurement of the predetermined time by the measuring means is completed early, and the operation control means inputs the signal indicating the non-operation from the partner machine, which is the spare machine, to operate the self machine, A signal indicating the operation of the own machine is output to the other machine. On the other hand, in the standby machine, after measuring the predetermined time by the measuring means, the signal indicating the operation from the partner machine, which is the active machine, is not input and the own machine is not operated, and the signal indicating the non-operation is transmitted to the active machine. Output.

Further, in the invention according to claim 2 configured as described above, the operation control means is such that the operation status recognition means is provided when a signal indicating the operation status is not input from the partner machine due to some abnormality or maintenance. On the assumption that the partner machine is not in operation, and let the operation control means recognize it.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an active backup switching device according to an embodiment of the present invention.

In the figure, 1 is a working unit and 11 is a spare unit, each having three input / output terminals. Three-terminal NAN in each unit 1 and 11
D gates 2 and 12 are provided, and the output of the NAND gate 2 is output from the NAND gate 12 via the input / output terminal.
Of the NAND gate 12 is connected to the input terminal 8 of the NAND gate 2.

Further, the outputs of the reset circuits 3 and 13 whose reset times are determined according to the capacitances of the capacitors 4 and 5 and the capacitors 14 and 15 are input to the other input terminals 7 and 17 of the NAND gates 2 and 12, respectively. ing. Here, the capacitors 4 and 14 have one terminal grounded, the capacitors 5 and 15 have one terminal connected to the input / output terminal, and among the input / output terminals to which the capacitors 5 and 15 are connected, Only the input / output terminals of the spare unit 11 are grounded. The capacitors 4 and 14 have the same capacitance.

Further, the input terminals 8 and 18 from the other party in the NAND gates 2 and 12 have pull-up resistors 10 and 2, respectively.
Pulled up by 0. Next, the operation of this embodiment having the above configuration will be described. When the power of the working unit 1 and the standby unit 11 is turned on at the same time, the reset circuits 3 and 13 output the reset signal for a time constant time corresponding to the capacitances of the capacitors 4,5, 14 and 15, and the NAND gates 2 and 12 operate. Since "0" is input to the input terminals 7 and 17, the outputs of both NAND gates 2 and 12 are "1", and both units 1 and 11 are on standby.

By the way, the electrostatic capacity that determines the time constant of the working unit 1 is determined only by the grounded capacitor 4, and is determined by the sum of the capacitances of the grounded capacitors 14 and 15 in the backup unit 11. Therefore, since the time constant of the active unit 1 is shorter and the reset circuit 3 stops outputting the reset signal earlier than the reset circuit 13, the output of the NAND gate 2 becomes "0".

Then, the active unit 1 starts up first, and the output of the NAND gate 2 is input to the input end 18 of the NAND gate 12 via the input / output terminal.
The output of the NAND gate 12 is maintained at "1" and the standby unit 11 waits. To switch the active backup,
A “0” pulse is input to the input terminal 6 of the NAND gate 2. Then, the output of the NAND gate 2 becomes "1",
While the active unit 1 is on standby, the output of the NAND gate 2 is input to the input end 18 of the NAND gate 12 and the output of the NAND gate 12 becomes "0".

If the working unit 1 is removed while it is operating, the NAND gate 1
The input terminal 18 of 2 is set to "1" by the pull-up resistor 20, the output of the NAND gate 12 is set to "0", and the standby unit starts up.

[0019]

As described above, since the present invention is incorporated into the working machine and the spare machine, it is possible to improve the stability of the system without having to worry about the spare as in the case of using the machine alone. At the same time, in the case of maintenance, the other machine is activated only by removing the active machine or the standby machine, so that it is possible to provide the active backup switching device that can facilitate the maintenance.

[Brief description of drawings]

FIG. 1 is a block diagram of an active backup switching device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional active backup switching device.

[Explanation of symbols]

 1, 11 ... Unit 2, 12 ... NAND gate 3, 13 ... Reset circuit 4, 5, 14, 15 ... Capacitor 6, 16 ... Input end 7, 17 ... Input end 8, 18 ... Input end 10, 20 ... Pull-up resistance

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location H02J 1/00 308 C 7373-5G

Claims (2)

[Claims] 1. A working standby switching device provided in a working machine and a standby machine for switching between the working machine and the standby machine in a working standby system including the working machine and the standby machine, which is a predetermined time from power-on. The measuring means for measuring the progress of the other machine and the signal indicating the operation status from the other machine are input, and when the other machine is not operating after the predetermined time is measured by the above measuring machine, the own machine is operated and the operation of the own machine is started. An operation that outputs a signal indicating to the partner machine and, conversely, does not operate the partner machine while the partner machine is operating after the predetermined time is measured by the measuring means and outputs a signal indicating the non-operation of the partner machine to the partner machine An active standby switching device comprising: a control means and a measurement time extension means for lengthening the measurement time of the measurement means when selected as a standby machine. 2. The active standby switching device according to claim 1, wherein the operation control means assumes that the partner machine is not in operation when a signal indicating the operation status from the partner machine is not input. An active backup switching device, characterized in that it has an operating condition recognition means for recognition.