JP2021153271A - Optical communication device and transmission path abnormality detection method - Google Patents

Abstract

To speed up abnormality detection of transmission paths using optical lines and quickly stop a gate enable signal when a transmission path abnormality is detected.SOLUTION: In a slave control device 3 that outputs a gate signal to a power conversion device by communication with a master control device 2 via an optical fiber cable 10, a signal determination unit 33 detects an abnormality of a transmission path of the optical fiber cable 10 based on a gate enable signal received from the master control device 2 via the optical fiber cable 10. When the abnormality is detected, the slave control device 3 outputs control information for stopping transmission of the gate enable signal to the master control device 2 and also outputs a signal for stopping output of the power conversion device as the gate signal.SELECTED DRAWING: Figure 1

Description

The present invention relates to a technique for detecting an abnormality in a transmission line of a transmission system using an optical line.

As a communication device capable of responding when an abnormality occurs in a serial data transmission line using an optical line, for example, there are optical communication devices disclosed in Patent Documents 1 and 2, which are used by two circuits for transmission and reception. Has been done. The timer counter is turned up when the received signal is 0 as a process when the transmission line is abnormal. When the timer exceeds the threshold value, the permission signal is dropped, it is determined that the communication is cut off, and the optical transmission is stopped.

JP-A-2002-290348 Japanese Unexamined Patent Publication No. 2004-336132

An optical line may also be used in a transmission system in which a power conversion device is controlled by a master control device and a slave control device. When the detection method of Patent Document 1 is applied in this transmission system, control information such as a voltage command value and a gate enable signal is transmitted as serial data from the master control device to the slave control device via an optical line. The voltage (output) of the unit of the power conversion device is controlled in the slave control device. The gate enable signal is a signal that determines the output state of the power converter, and when a failure occurs, it is necessary to stop the power converter promptly so as not to damage the power converter.

Further, in the above transmission system, since the serial data is transmitted from the detection of the failure by the master control device to the stop of the output of the unit, a delay occurs in proportion to the amount of the transmitted data. This effect may delay the transmission of the gate enable signal and damage the power converter. As a countermeasure, it is conceivable to add one dedicated circuit for the gate enable signal and judge whether or not the output of the power converter can be output at high speed based on the binary values of 1 (output) and 0 (stop).

However, when the power converter is fixed to High due to an abnormality in the communication circuit during the output of the power conversion device, the transmission line abnormality cannot be detected and the gate enable signal cannot be stopped even if a failure occurs during the transmission line abnormality. As a result, the power conversion device may continue to output an excessive output and cause damage.

An object of the present invention is to speed up detection of an abnormality in a transmission line using an optical line and to quickly stop a gate enable signal when an abnormality in a transmission line is detected.

Therefore, one aspect of the present invention is a slave-side optical communication device that outputs a gate signal to the power conversion device by communicating with the master-side optical communication device, from the master-side optical communication device via an optical line. A signal determination unit for detecting an abnormality in the transmission line of the optical line based on the received gate enable signal is provided, and when the abnormality is detected, control information for stopping the transmission of the gate enable signal is transmitted to the optical on the master side. Along with outputting to the communication device, a signal for stopping the output of the power conversion device is output as the gate signal.

In one aspect of the present invention, in the optical communication device, the optical line has a plurality of lines, and the signal determination unit detects the abnormality based on the waveform of the gate enable signal received from the line. It includes a path abnormality detection circuit and a logic sum circuit that outputs a signal indicating the abnormality when receiving a signal indicating the abnormality from the transmission line abnormality detection circuit.

In one aspect of the present invention, in the optical communication device, the transmission line abnormality detection circuit includes a counter that counts the number of consecutive phase sections in which the pulse signal of the gate enable signal of the transmission line has a predetermined waveform, and the continuation. It is provided with a comparator that outputs a signal indicating an abnormality in the transmission line when the number exceeds the threshold value.

In one aspect of the present invention, in the optical communication device, the optical line has a plurality of lines, and the signal determination unit receives a signal of a predetermined waveform of the plurality of lines received from the optical communication device on the master side. A first logic sum circuit that emits an output signal based on any of the above, an inverting amplifier circuit that inverts a signal having the predetermined waveform, and a second logic sum circuit that emits an output signal based on any of the inverted signals. Based on the output signals of the first logic sum circuit and the second logic sum circuit, the first output value indicating that the transmission line is normal or the second output value indicating that the transmission line is abnormal is output. It is provided with a logical product circuit.

One aspect of the present invention is a method of detecting a transmission path abnormality by a slave-side optical communication device that outputs a gate signal to a power conversion device by communicating with a master-side optical communication device, from the master-side optical communication device. The process of detecting an abnormality in the transmission line of the optical line based on the gate enable signal received via the optical line and the control information for stopping the transmission of the gate enable signal when the abnormality is detected are transmitted to the optical of the master side. It has a process of outputting to a communication device and outputting a signal for stopping the output of the power conversion device as the gate signal.

According to the above invention, it is possible to speed up the detection of an abnormality in a transmission line using an optical line and to quickly stop the gate enable signal when a transmission line abnormality is detected.

The block diagram of the transmission system of Embodiment 1 which is one aspect of this invention. (A) A block diagram of a signal determination unit on the slave side in the first embodiment, and (b) a block diagram of a transmission abnormality detection circuit of the signal determination unit. The transmission signal pattern of the first embodiment. A signal pattern indicating a transmission line abnormality (abnormality at a phase of 180 °) when the signal n is fixed to low. A signal pattern indicating a transmission line abnormality (abnormality at a phase of 180 °) when the signal n is fixed to high. The block diagram of the transmission system of Embodiment 2 which is one aspect of this invention. FIG. 2 is a block diagram of a signal determination unit on the slave side in the second embodiment. (A) An example of the pulse pattern of the signals 1 to 3 of the second embodiment, and (b) an example of the output value of each phase section in the pulse pattern when the transmission line is normal. (A) An example of a pulse pattern of signals 1 to 3 indicating a transmission line abnormality (abnormality at a phase of 180 °) when signal 1 is fixed to high and an output signal of each logic circuit in the signal determination unit, (b) signal. An example of the pulse pattern indicating a transmission line abnormality (abnormality at a phase of 180 °) when 1 is fixed to low. An example of the output value of each phase section in the pulse pattern of the signal 1 of FIGS. 9A and 9B. (A) An example of a pulse pattern of signals 1 to 3 indicating a transmission line abnormality (abnormality at a phase of 180 °) when signal 2 is fixed to high and an output signal of each logic circuit in the signal determination unit, (b) signal. An example of the pulse pattern showing a transmission line abnormality (abnormality at a phase of 180 °) when 2 is fixed to low. An example of the output value of each phase section in the pulse pattern of the signal 2 of FIGS. 11A and 11B. (A) An example of a pulse pattern of signals 1 to 3 indicating a transmission line abnormality (abnormality at a phase of 180 °) when signal 3 is fixed to high and an output signal of each logic circuit in the signal determination unit, (b) signal. An example of the pulse pattern showing a transmission line abnormality (abnormality at a phase of 180 °) when 3 is fixed to low. An example of the output value of each phase section in the pulse pattern of the signal 3 of FIGS. 13 (a) and 13 (b).

An embodiment of the present invention will be described below with reference to the drawings.

[Embodiment 1]
The transmission system 1 illustrated in FIG. 1 has a master control device 2 and a slave control device 3 capable of transmitting to each other. The master control device 2 and the slave control device 3 are connected via an optical fiber cable 10 which is an optical line for transmitting control information and a gate enable signal (hereinafter, enable signal). The optical fiber cable 10 has a plurality of lines. The optical line of the present invention may have two or more lines, and is not limited to the number of lines shown in the figure.

(Example of mode of master control device 2)
The master control device 2 is an optical communication device on the master side of the transmission system 1 and transmits / receives control information and enable signals to / from the slave control device 3.

The master control device 2 includes a communication control unit 21, voltage level conversion units 220, 221-224, and E / O conversion units 230, 231-234.

The communication control unit 21 generates control information and enable signals (hereinafter, signals 1 to 4) to be provided to the slave control device 3.

The voltage level conversion unit 220 converts the control information from the communication control unit 21 into a predetermined voltage level suitable for the IC of the E / O conversion unit 230.

The voltage level conversion units 221 to 224 convert the pulse patterns of the signals 1 to 4 from the communication control unit 21 into predetermined voltage levels suitable for the ICs of the E / O conversion units 231 to 234, respectively.

The E / O conversion unit 230 converts an electric signal indicating the voltage level of the control information received from the voltage level conversion unit 220 into an optical signal.

The E / O conversion units 231 to 234 convert electrical signals indicating the voltage levels of the signals 1 to 4 received from the voltage level conversion units 221 to 224 into optical signals, respectively.

(Example of mode of slave control device 3)
The slave control device 3 is an optical communication device on the slave side of the transmission system 1, and transmits / receives control information and receives an enable signal to / from the master control device 2, and a gate signal to a power control device (not shown). Is output.

The slave control device 3 includes an O / E conversion unit 310-314, a voltage level conversion unit 320 to 324, and a signal determination unit 33.

The O / E conversion unit 310 converts the optical signal of the control information provided from the master control device 2 via the optical fiber cable 10 into an electric signal.

The O / E conversion units 31 to 314 convert the optical signals of the signals 1 to 4 provided from the master control device 2 via each line of the optical fiber cable 10 into electric signals, respectively.

The voltage level conversion unit 320 converts the electric signal received from the O / E conversion unit 310 into a predetermined voltage level suitable for the IC of the signal determination unit 33.

The voltage level conversion units 321 to 324 convert the electric signals of the signals 1 to 4 received from the O / E conversion units 31 to 314 into predetermined voltage levels suitable for the IC of the signal determination unit 33, respectively.

The signal determination unit 33 receives the electric signal of the control information from the voltage level conversion unit 320, and whether the transmission line of the optical fiber cable 10 is normal based on the voltage levels of the signals 1 to 4 from the voltage level conversion units 321 to 324. Judge whether or not.

(Example of mode of signal determination unit 33)
As illustrated in FIG. 2A, the signal determination unit 33 includes a plurality of transmission line abnormality detection circuits 331 to 334 corresponding to the number of lines of the optical fiber cable 10 and a logical sum circuit 335.

The transmission line abnormality detection circuits 331 to 334 detect the abnormality of the transmission line based on the waveforms of the signals 1 to 4 received from the voltage level conversion units 321 to 324.

When the OR circuit 335 receives a signal indicating an abnormality of the transmission line from any of the transmission line abnormality detection circuits 331 to 334, the OR circuit 335 outputs a signal indicating the abnormality of the transmission line.

When the signal determination unit 33 detects the abnormality, the slave control device 3 outputs control information for stopping the transmission of the signals 1 to 4 to the master control device 2 and a gate for stopping the output of the power conversion device. The signal is output to the power converter.

(Example of mode of transmission line abnormality detection circuit 331-334)
As illustrated in FIG. 3B, the transmission line abnormality detection circuits 331 to 334 include a low continuous detection circuit 41, a high continuous detection circuit 42, and a disjunction circuit 43.

The low continuous detection circuit 41 includes a counter 411, a threshold value setting unit 412, a comparator 413, and an inverting amplifier circuit 414. The counter 411 counts the number of consecutive phase sections in which the pulse signal of the signal n (n = 1 to 4 in this embodiment) provided as the enable signal from the master control device 2 becomes a predetermined waveform (low). The threshold value setting unit 412 sets the threshold value of the continuous number in advance. The comparator 413 outputs a signal indicating an abnormality in the transmission line of the signal n when the continuous number exceeds the threshold value in the threshold value setting unit 412. The inverting amplifier circuit 414 inverts the signal n and uses it for counting of the counter 411.

The high continuous detection circuit 42 includes a counter 421, a threshold value setting unit 422, a comparator 423, and an inverting amplifier circuit 424. The counter 421 counts the number of consecutive phase sections in which the pulse signal of the signal n (n = 1 to 4 in this embodiment) provided as the enable signal from the master control device 2 has a predetermined waveform (high). The threshold value setting unit 422 sets the threshold value of the continuous number in advance. The comparator 423 outputs a signal indicating an abnormality in any of the transmission lines when the continuous number exceeds the threshold value in the threshold value setting unit 422. The inverting amplifier circuit 424 inverts the signal n and uses it to clear the counter 421.

When the OR circuit 43 receives a signal indicating an abnormality from either the low continuous detection circuit 41 or the high continuous detection circuit 42, the OR circuit 43 outputs a signal indicating an abnormality in the line of the signal n.

(Operation example of this embodiment)
Hereinafter, an operation example of the first embodiment will be described with reference to FIGS. 1 to 5.

The communication control unit 21 of the master control device 2 gives an enable signal to generate signals 1 to 3 of the pulse pattern illustrated in FIG.

The signal 1 changes the value to low and high in the range of 360/4 × 0 to 360/4 × 1 (360 / n, n is the number of circuits used). The signal 2 changes the signal in the range of 360/4 × 1 to 360/4 × 2, and the signal 3 and the signal 4 also change the signal within the specified range, respectively.

The master control device 2 transmits signals 1 to 4 to the slave control device 3. The slave control device 3 receives signals 1 to 4 and determines an abnormality in the transmission line of the optical fiber cable 10. In the signal determination unit 33, the high continuous detection circuit 42 of FIG. 2B clears the counter 421 at the timing when the signals 1 to 4 become 0, and determines an abnormality when the counter 421 is not cleared. The threshold value of is set by the threshold value setting unit 422. On the other hand, in the low continuous detection circuit 41, the timing at which the counter 411 is cleared is opposite to that at the high continuous detection circuit 42, and the counter is cleared at the timing when the signals 1 to 4 become 1.

FIG. 4 shows a signal pattern of the low continuous detection circuit 41 when the signal n is fixed to low due to an abnormality in the transmission line. FIG. 5 shows a signal pattern of the high continuous detection circuit 42 when the signal n is fixed to high due to an abnormality in the transmission line.

As described above, the slave control device 3 has an abnormality in the transmission line based on the enable signals indicated by the binary values of "1" and "0" provided from the master control device 2 via the transmission line of the optical fiber cable 10. To judge.

Therefore, according to the transmission line abnormality detection method of the present embodiment, when detecting a transmission line abnormality using an optical line, the transmission line abnormality is detected at a higher speed and the gate enable signal is quickly detected as compared with serial data communication. Can be stopped at.

[Embodiment 2]
In the present embodiment, the signal determination unit 33 of the slave control device 3 is configured only with a logic circuit to simplify the circuit configuration and speed up the detection of abnormalities in the transmission line.

The transmission system illustrated in FIG. 6 has three optical communication lines for enable signals.

The transmission system 1 of the present embodiment is the first embodiment except that the signal determination unit 33 of the slave control device 3 is composed only of a logic circuit without the counters 411 and 421 of the first embodiment as shown in FIG. The mode is the same as that of the transmission system 1 of the above.

The signal determination unit 33 includes a first OR circuit 51, an inverting amplifier circuit 521 to 523, a second OR circuit 53, and a AND circuit 54.

The first OR circuit 51 outputs a signal OR based on any of the signals 1 to 3 having a predetermined waveform received from the communication control unit 21 of the master control device 2.

The inverting amplifier circuits 521 to 523 output signals 1 * to 3 *, which are inverting signals 1 to 3 received from the master control device 2, respectively.

The second OR circuit 53 outputs a signal OR * based on any of the signals 1 * to 3 * received from the inverting amplifier circuits 521 to 523.

The AND circuit 54 outputs a signal AND based on the output signal OR of the first OR circuit 51 and the output signal OR * of the second OR circuit 53. For example, when the transmission line is normal, the signal AND outputs "1" as the first output value indicating normality. On the other hand, when the transmission line is abnormal, the signal AND outputs "0" as a second output value indicating the abnormality.

An operation example of the second embodiment will be described with reference to FIGS. 8 to 14.

The master control device 2 transmits signals 1 to 3 of the pulse pattern illustrated in FIG. 8A to the slave control device 3. The slave control device 3 determines an abnormality in the transmission line of the transmission system 1 based on the signals 1 to 3 by the signal determination unit 33 of FIG.

FIG. 3B shows the outputs of signals 1 to 3, signals 1 * to 3 *, signal OR, signal OR *, and signal AND in each phase section in the pulse pattern of signals 1 to 3 when the transmission line is normal. An example of the value is shown. When the transmission line is normal, the signal AND is always output as "1".

9 to 14 show the pulse patterns of signals 1 to 3 when the transmission line is abnormal and the outputs of signals 1 to 3, signals 1 * to 3 *, signal OR, signal OR *, and signal AND in each phase section thereof. An example of the value is shown.

FIG. 9A shows an example of a pulse pattern of signals 1 to 3 indicating a transmission line abnormality (abnormality at a phase of 180 °) when signal 1 is fixed to high and an output signal of each logic circuit in the signal determination unit. show. FIG. 3B shows an example of the pulse pattern showing a transmission line abnormality (abnormality at a phase of 180 °) when the signal 1 is fixed at low. FIG. 10 shows an example of the output value of each phase section in the pulse pattern of FIGS. 9A and 9B.

FIG. 11A shows an example of a pulse pattern of signals 1 to 3 indicating a transmission line abnormality (abnormality at a phase of 180 °) when the signal 2 is fixed to high and an output signal of each logic circuit in the signal determination unit. show. FIG. 2B shows an example of the pulse pattern showing a transmission line abnormality (abnormality at a phase of 180 °) when the signal 2 is fixed at low. FIG. 12 shows an example of the output value of each phase section in the pulse pattern of FIGS. 11A and 11B.

FIG. 13A shows an example of the pulse patterns of the signals 1 to 3 indicating a transmission line abnormality (abnormality at a phase of 180 °) when the signal 3 is fixed to high and the output signal of each logic circuit in the signal determination unit. show. FIG. 3B shows an example of the pulse pattern showing a transmission line abnormality (abnormality at a phase of 180 °) when the signal 3 is fixed at low. FIG. 14 shows an example of the output value of each phase section in the pulse pattern of FIGS. 13 (a) and 13 (b).

The output value "1" of the signal AND output from the signal determination unit 33 due to the abnormality of the transmission line is held by a self-holding circuit such as a latch processing circuit mounted on the slave control device 3, for example.

Therefore, according to the transmission line abnormality detection method of the second embodiment, by determining the transmission line abnormality by the binary values of "1" and "0", as in the first embodiment, the transmission line is compared with the serial data communication. Anomalies can be detected at high speed and the gate enable signal can be stopped quickly. In particular, since the signal determination unit 33 is composed of only a logic circuit, the circuit configuration can be simplified. Further, the speed of detecting an abnormality in the transmission line can be increased. In particular, as compared with the detection method of the first embodiment, the abnormality can be detected within 180 ° from the occurrence of the failure of the transmission line.

1 ... Transmission system 2 ... Master control device, 21 ... Communication control unit, 220 to 224 ... Voltage level conversion unit, 230 to 234 ... E / O conversion unit 3 ... Slave control device, 310 to 314 ... O / E conversion unit, 320 to 324 ... Voltage level conversion unit, 33 ... Signal determination unit 331-334 ... Transmission line abnormality detection circuit, 335 ... Logical sum circuit 41 ... low continuous detection circuit, 42 ... high continuous detection circuit 411, 421 ... Counter, 421 422 ... Voltage setting unit, 413, 423 ... Comparator 51 ... First logic sum circuit, 521-523 ... Inversion amplifier circuit, 53 ... Second logic sum circuit, 54 ... Logical product circuit 10 ... Optical fiber cable

Claims (5)

It is an optical communication device on the slave side that outputs a gate signal to the power conversion device by communicating with the optical communication device on the master side.
A signal determination unit for detecting an abnormality in the transmission line of the optical line based on a gate enable signal received from the optical communication device on the master side via the optical line is provided.
When the abnormality is detected, control information for stopping the transmission of the gate enable signal is output to the optical communication device on the master side, and a signal for stopping the output of the power conversion device is output as the gate signal. An optical communication device characterized by. The optical line has a plurality of lines and has a plurality of lines.
The signal determination unit
A transmission line abnormality detection circuit that detects the abnormality based on the waveform of the gate enable signal received from the line, and
The optical communication device according to claim 1, further comprising a logical sum circuit that outputs a signal indicating the abnormality when receiving a signal indicating the abnormality from the transmission line abnormality detection circuit. The transmission line abnormality detection circuit is
A counter that counts the number of consecutive phase sections in which the pulse signal of the gate enable signal of the transmission line has a predetermined waveform, and
The optical communication device according to claim 2, further comprising a comparator that outputs a signal indicating an abnormality in the transmission line when the number of continuous lines exceeds a threshold value. The optical line has a plurality of lines and has a plurality of lines.
The signal determination unit
A first OR circuit that emits an output signal based on any of the signals having a predetermined waveform of the plurality of lines received from the optical communication device on the master side.
An inverting amplifier circuit that inverts the signal of the predetermined waveform and
A second OR circuit that emits an output signal based on any of the inverted signals,
Based on the output signals of the first OR circuit and the second OR circuit, the first output value indicating that the transmission line is normal or the second output value indicating that the transmission line is abnormal is output. The optical communication device according to claim 1, further comprising a logical product circuit. It is a transmission line abnormality detection method by the optical communication device on the slave side that outputs a gate signal to the power conversion device by communicating with the optical communication device on the master side.
The process of detecting an abnormality in the transmission line of the optical line based on the gate enable signal received from the optical communication device on the master side via the optical line, and
When the abnormality is detected, the process of outputting control information for stopping the transmission of the gate enable signal to the optical communication device on the master side and outputting a signal for stopping the output of the power conversion device as the gate signal. A method for detecting an abnormality in a transmission line, which comprises having.

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