JP2667512B2 - Multiplex controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention has a plurality of control circuits for one control target. For example, one control circuit detects a failure during operation control. In this case, the present invention relates to a highly reliable multiplexing control device that automatically executes a fault reset, selects a sound control circuit, and immediately resumes operation control.

(Prior Art) Here, a power converter using a thyristor element is used as a control target, and a thyristor phase control device is used as a control device. The power converter includes a forward converter that converts an alternating current into a direct current, a current transformer that detects a current flowing through the forward converter, and a transformer that detects an output voltage of the forward converter. The phase control device detects a failure by a voltage control circuit or a current control circuit, a phase control circuit that controls a conduction phase of a cyclist by using these outputs, and the current of the forward converter and a voltage detection signal. Protection circuit. For these basic operations, see “Operation and maintenance of thyristor-controlled DC motor”, for example.
This is described in detail in Chapter 2 P31 to P57 of Chapter 2 (published by Denki Shoin) of the multiplex control.

Two control circuits are provided for one power converter,
FIG. 3 shows a configuration in which the power converter is always controlled by only one control circuit, and when an abnormality occurs in that circuit, the control is switched to another sound control circuit to continue the control. In FIG. 3, when an abnormality occurs during the operation of the control circuit A6, a failure signal A60 of the control circuit A6 is input to the selection circuit 8, and the selection circuit 8 selects a sound control circuit B7, and the switching circuit 80 Then, the control circuit is switched to the control circuit B7. Thereby, the operation control of the power converter 2 is continued. At this time, the display circuit 81 displays the failure of the control circuit A6 by the failure signal 60 of the control circuit A6. If an abnormality occurs in the control circuit B7 during operation in this state, the control circuit A6 and the control circuit B7
The control device stops the control of the power converter 2 as the double failure of the above. In addition, one control circuit abnormality affects the input current and the output voltage of the power converter 2, and these abnormal operations are detected by the current transformer A41 and the current transformer B42 for the input current. Voltage detector A for output voltage
53 and the voltage detector B54, the control circuit A6
Then, the control circuit B7 is simultaneously in a failure state and the power converter 2
Stop the control of.

(Problems to be Solved by the Invention) As described above, the conventional technology has the following problems.

(1) Since the power converter 2 to be controlled is common, if one of the control circuits malfunctions, the power converter 2
As a result, the control circuit A6 and the control circuit B7 fail simultaneously, and the control of the power converter 2 is stopped.

(2) When the control circuit fails, it is necessary to recover from the failure in a human system.

(3) Immediately after one of the control circuits becomes abnormal and switches to the other, if the fault is detected again on the side of the control circuit switched by the transient change, a double fault occurs in the control circuit and the control of the power converter 2 stops. .

The present invention has been made in view of the problems of the related art, and when an abnormality occurs in one control circuit, a failure reset signal is sent to all multiplexed control circuits by a failure signal from the control circuit. Automatically input, then select a normal control circuit by the selection circuit, continue the operation control of the power converter, and for the control circuit that does not recover from the failure even with the failure reset signal, the operation power supply of the control circuit To provide a multiplexing control device capable of initializing (initializing) all the signals in the control circuit, removing the fault signal, and continuing the control of the power converter by interrupting the power converter for a short time.

(Means for Solving the Problem) FIG. 1 shows the configuration of the present invention. The control circuit A6 and the control circuit B7 are multiplexed control circuits, a switching circuit 80 for switching the multiplexed control circuits, the power converter 2 whose operation is controlled by the control circuit, and the power converter 2
Current transformers A41 and B42 for detecting the input current of the power converter 2, and a voltage detector A53 for detecting the output voltage of the power converter 2
And a voltage detector B54 and the multiplexed control circuit A6
Further, during operation control of the power converter 2 by any one of the control circuits B7, it is detected that the control circuits A6 and B7 have failed, and a failure reset signal is sent to all multiplexed control circuits. An automatic reset circuit 9 for outputting a short-time interruption of the operation power supply of the control circuit to a control circuit which outputs the fault reset signal and continues the fault after the fault reset signal is input; When the circuit is in a failure state, the display circuit 81 for judging and displaying that the control circuit is abnormal, and the operation of the automatic reset circuit 9, when the control circuit A6 and the control circuit B7 recover from the failure, select the control circuit that has recovered from the failure. And a switching circuit 80 for switching the control circuit according to a selection signal from the selection circuit 8.

(Operation) With the above configuration, one control circuit, for example, the control circuit
When an abnormality occurs in A6 during operation, a failure reset signal 90 is input from the automatic reset circuit 9 to the control circuit A6 and the control circuit B7 multiplexed by the failure signal 60. After the completion of the failure reset signal 90, the automatic reset circuit 9 determines whether the control circuit A6 and the control circuit B7 are in a failure state or a controllable state. Power initialization signal that shuts off for a short time (Power initialization signal for control circuit A6
92, power supply initialization signal 91 for control circuit B7)
Is output again by the automatic reset circuit 9. In the control circuit in which the power supply initialization has been performed, all the control signals are initialized, so that all the failure modes except for the hardware failure of the components are released, and the operation control of the power converter 2 is continued.

(Embodiment) An embodiment of the present invention is shown in FIG. The control circuit A6 and the control circuit B7 are multiplexed control circuits. The switching circuit 80 for switching these multiplexed control circuits includes a power converter 2 whose operation is controlled by the control circuit; And a current transformer B42 for detecting the input current of the second
And a voltage detector A53 and a voltage detector B54 for detecting an output voltage of the power converter 2, and a power converter based on any one of the multiplexed control circuits A6 and B7. During operation control of control circuit 2, control circuit A6 and control circuit B7
Detects a failure, outputs a failure reset signal to all the multiplexed control circuits, and also reduces the operation power supply of the control circuit for the control circuit that continues to fail after the failure reset signal is input for a short time. An automatic reset circuit 9 for shutting down, and a display circuit 81 for judging and displaying a control circuit abnormality when the control circuit is in a failure state after the operation of the automatic reset circuit 9 is completed,
When the control circuit A6 and the control circuit B7 recover from the failure by the action of the automatic reset circuit 9, the selection circuit 8 selects the control circuit that has recovered from the failure, and a switching circuit that switches the control circuit according to the selection signal of the selection circuit 8. Composed of 80. FIG. 2 shows a detailed configuration of the automatic reset circuit 9. The automatic reset circuit 9 includes the control circuit
In response to the failure signal 60 from A6, OR the failure reset signal 90
A fault reset signal generator 61 output via a circuit 94;
A failure reset signal generator 71 that receives a failure signal 70 from the control circuit B7 and outputs a failure reset signal 90 via an OR circuit 97, and a failure reset signal 90 that is an output signal of the OR circuit 97. Upon completion, the power supply initialization signal generator 62 that checks the failure signal 60 from the control circuit A6, and outputs a power supply initialization signal 92 if a failure occurs,
Similarly, when the failure reset signal 90, which is the output signal of the OR circuit 97, is completed, the failure signal 70 from the control circuit B7 is output.
Check that the power supply initialization signal 91
A power initialization signal generator 72 for outputting
Upon completion of the power supply initialization signal 92, the control circuit
A failure signal 60 from A6 is confirmed, and if a failure is detected, a failure detector A63 that outputs a failure indication signal 93 of the control circuit A6, and a failure from the control circuit B7 when the power initialization signal 91 is completed. The signal 70 is confirmed, and if it is in a failure state, it is constituted by a failure detector B73 which outputs a failure indication signal 94 of the control circuit B7.

With the above configuration, one control circuit, for example, the control circuit
If an error occurs during A6 operation, the multiplexed control circuit is output from the fault reset signal generator 61 by the fault signal 60.
The fault reset signal 90 is input to A6 and the control circuit B7. After completion of the failure reset signal 90, the automatic reset circuit 9 determines whether the control circuit A6 and the control circuit B7 are in the failure state or the controllable state by the power supply initialization signal generator A62 and the power supply initialization signal generator B72,
For a control circuit in a fault state, the power supply initialization signal (control circuit
A6 is a power initialization signal, and a control circuit B7 is a power initialization signal 91). A power initialization signal generator A62 and a power initialization signal generator B are provided.
Output by 72. In the control circuit in which the power supply initialization has been performed, all the control signals are initialized, so that all the failure modes except for the hardware failure of the components are released, and the operation control of the power converter 2 is continued.

As described above, the present invention can obtain the following effects.

(1) In the multiplexed control circuit, even if the control circuit becomes abnormal, failure recovery can be automatically performed.

(2) Since a fault recovery is performed automatically, the multiplexing configuration can be kept to the maximum, and a great improvement in reliability can be realized.

(3) Due to the effect of the above item (2), the operation rate of the system to which the control device of the present configuration is applied is greatly improved.

(4) An abnormality in one control circuit affects the input current and output voltage of the power converter. Even if all the multiplex control circuits detect a failure, the automatic failure reset causes the operation of the power converter. Control can be continued.

[Effects of the Invention] According to the present invention, a control circuit is multiplexed for one control target, and in a control device that always controls the operation of the control target by one control circuit, even if any control circuit fails, each A failure reset signal or a power supply initialization signal is input to all control circuits based on the failure signal output from the control circuit, and the failure mode is automatically canceled. And a highly reliable multiplexing control device. In particular, when the control target is common to the multiplexed control circuit, the abnormality of one control circuit affects the input / output of the control target, and as a result, all the detectors that detect the input / output amount of the control target are used. May simultaneously detect an abnormal signal, and all of the multiplexing control circuits may become abnormal at the same time. Even in such a state, the operation control of the control target can be continued by the failure reset signal and the power supply initialization signal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
FIG. 3 is a block diagram showing a detailed example of the automatic reset circuit shown in FIG.
FIG. 1 is a configuration diagram of a conventional device. 1 ... AC power supply, 2 ... Power converter, 3 ... Load, 4 ...
... reference setting device, 6 ... control circuit A, 7 ... control circuit B,
8 selection circuit, 9 automatic reset circuit, 41 current transformer A, 42 current transformer B, 43, 44 rectifier, 51a, 51b, 52
a, 52b ... resistor, 53 ... voltage detector A, 54 ... voltage detector B, 60 ... failure signal A, 70 ... failure signal B, 80 ...
Switching circuit, 81 Display circuit, 61 Fault reset signal generator A, 71 Fault reset signal generator B, 62
Power supply initialization signal generators A, 72 ... Power supply initialization signal generators B, 63 ... Failure detectors A, 73 ... Failure detectors B. 97: OR circuit, 90: Fault reset signal, 91
... Power initialization signal A, 92 Power initialization signal B, 93 Fault indication signal A, 94 Fault indication signal B

Claims (1)

(57) [Claims] 1. A multiplexed control circuit comprising: a multiplexed control circuit; a switching circuit for switching between these multiplexed control systems; a controlled object whose operation is controlled by the control circuit; and a detector for detecting an operation amount of the controlled object. In the activation control device, during operation control of a control target by any one of the multiplexed control systems or all control circuits, first means for detecting that the control circuit has detected a failure, A second means for receiving a signal from the first means and outputting a failure reset signal to all multiplexed control circuits, a third means for selecting a control circuit which has recovered from the failure after inputting the failure reset signal, A fourth means for short-time shutting down the operation power supply of the control circuit for the control circuit which continues to fail after the reset signal is input. When the operation of the fourth means is completed and the control circuit is still in a failure state, the control is performed. Circuit difference Multiplexing control apparatus characterized by comprising a fifth means for determining that.