JP2009065261A - Discriminator of switch operating state, and monitoring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for discriminating the operating state of a switch provided in a monitored apparatus or the like inexpensively by simple circuitry. <P>SOLUTION: A notification switch 111 indicating the operating state of the monitored section 110 in a monitored apparatus 100 is connected with the DC power supply 212 of the monitoring section 210 in a monitoring apparatus 200 through a monitoring line 210a. The monitoring line 210a is inserted into the space on the inside of a core 211a constituting an AC current component detector 211. A detection winding 211b wound around the core 211a detects an AC current component contained in the rising part or the falling part of a monitoring current when the notification switch 111 is turned on or off. A discrimination circuit 215 discriminates the change in operating state of the notification switch 111 based on the AC current component detected by the detection winding 211b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for determining an operating state of a switch provided in a monitored apparatus or the like.

Various monitoring devices are provided to monitor the status of the monitored device. For example, a DC power source connected via a monitoring line to a notification switch indicating the state of the monitored device (normal state or abnormal state), and a DC current that detects a DC current flowing through the monitoring line and outputs a DC current detection signal There is known a monitoring device including a detection unit and a determination unit that determines an operation state of a notification switch based on a DC current detection signal output from the DC current detection unit (see Patent Document 1).
In the monitoring device having such a configuration, for example, when the monitored device is normal, the notification switch is in an off state (non-operating state), and no direct current flows through the monitoring line (open state). On the other hand, when an abnormality occurs in the monitored apparatus, the notification switch is turned on (operating state), and a direct current flows through the monitoring line (closed state). The direct current detection means detects a direct current flowing through the monitoring line and outputs a direct current detection signal (for example, a direct current detection means indicating the value of the direct current). The discriminating unit discriminates the operating state of the notification switch based on the DC detection signal. For example, when the DC current detection signal is less than the set value, it is determined that the notification switch is in an on state (operating state), that is, the monitored device is in an abnormal state. On the other hand, when the value of the DC current detection signal is equal to or greater than the set value, it is determined that the notification switch is in the off state (non-operating state), that is, the monitored device is in the normal state.
JP 2004-234247 A

In the conventional monitoring device, in order to determine the operation state of the switch, a direct current detection means for detecting a direct current flowing through a monitoring line connected between the notification switch and the direct current power source is used. Here, a monitoring device or the like that monitors a failure of a communication device is configured such that a minute direct current flows so as not to affect the communication device. Moreover, it is desired to detect a direct current in a non-contact manner. A hall element or the like is used as a direct current detection means for detecting a minute direct current in a non-contact manner. However, Hall elements and the like are expensive and the circuit configuration is complicated.
The present invention was devised in view of the above points, and it is possible to determine the operation state of a switch provided in a monitored device or the like at a low cost with a simple circuit configuration. The purpose is to provide technology.

In the following, the phrase “determining the switch operating state” is also used to indicate a configuration that “determines that the switch operating state has changed” or a configuration that “determines how the switch operating state changes”. It has been. The “switch operating state” includes, for example, an off state (non-operating state) and an on state (operating state). The “change in switch operating state” includes, for example, an off state (non-operating state). A change from an on state (operating state) or an on state (operating state) to an off state (non-operating state) is included, and the “change state of the operating state of the switch” includes, for example, the switch being in an off state (non-operating state) ) To an on state (operating state) or an on state (operating state) to an off state (non-operating state).
One aspect of the present invention is a switch operating state determination device having the following configuration.
The present invention is preferably used to determine the operating state of a mechanical switch having a fixed contact and a movable contact, but can be used to determine the operating state of various other switches. Further, the switches to be discriminated include various switches such as a notification switch that indicates the state of the monitored device. The switch may be a switch that automatically operates when an operation condition is satisfied, or may be a switch that is operated by a manual operation by an operator or the like. Further, switches having various configurations can be used as the switches. For example, a switch that prevents current from flowing in the circuit in the off state (non-operating state) (open state) and flows current to the circuit in the on state (operating state) (closed state), or an off state (non-operating state) (State) can be used to pass a current through the circuit (closed state) and to prevent the current from flowing through the circuit in the on state (operating state) (open state).
The present invention includes a DC power supply, AC current component detection means, and discrimination means.
The direct current power source is connected to the switch via a monitoring line. Thus, for example, when the switch is in an off state (non-operating state), a monitoring current containing a DC component does not flow through the monitoring line, but when the switch is in an on state (operating state), a monitoring current containing a DC component is applied to the monitoring line. Flowing. Here, when the operating state of the switch changes, for example, when it changes from an off state (non-operating state) to an on state (operating state) or from an on state (operating state) to an off state (non-operating state) Sometimes an alternating current component is included in the rising or falling portion of the monitored current waveform.
The alternating current component detection means detects the alternating current component contained in the rising or falling portion of the monitored current waveform when the switch operating state changes, and outputs an alternating current component detection signal. As the AC current component detection means, various detection means can be used, but it is preferable to use a detection means that can detect a minute AC current component included in the waveform of the monitoring current in a non-contact manner. For example, a detecting means for detecting an alternating current component in a non-contact manner using a magnetic action is used.
The discrimination means discriminates the operation state of the switch based on the alternating current component detection signal output from the alternating current component detection means. For example, based on the value of the alternating current component detection signal, it is determined that the switch operating state has changed or the switch operating state has changed. A processing circuit such as a CPU is used as the determination means.
The present invention can be suitably used when determining that the operating state of the switch has changed. For example, it can be used to determine a change in the operating state of a switch that is in an off state (non-operating state) when the monitored device is normal and is in an on state (operating state) when the monitored device is abnormal. In this case, by determining that the operating state of the switch has changed, it is determined that the switch has changed from the OFF state to the ON state, that is, the monitored device is in an abnormal state. Alternatively, for example, it can be used to determine the current operating state of a switch that is off in the initial state. In this case, based on the switch operating state in the initial state and the number of times the switch operating state has changed, it is possible to determine the current switch operating state (whether the switch is in the on state or the off state). .
Various methods can be used as a method for determining the operation state of the switch based on the value of the AC current component detection signal.
In the switch operating state discriminating apparatus of the present invention, an alternating current component included in the waveform of the monitoring current flowing through the monitoring line is detected, and the operating state of the switch (for example, the operating state of the switch) is detected based on the detected alternating current component. Has changed). For this reason, the operation state of the switch can be determined with a simple circuit configuration using an inexpensive alternating current component detection means. Even when a minute alternating current component is detected or when an alternating current component is detected in a non-contact manner, the operation state of the switch can be determined at a low cost with a simple circuit configuration.

When the operating state of the switch changes, an alternating current component is included in the rising or falling portion of the monitored current waveform. For this reason, as a method for determining the operation state of the switch, preferably, a method for determining the operation state of the switch based on a comparison result between the value of the AC current component detection signal and at least one of the upper limit value and the lower limit value. Used.
In the first aspect of determining the operating state of the switch based on the value of the AC current component detection signal, the determining means determines whether the AC current component detection signal value is within the range between the upper limit value and the lower limit value. It is determined that the operating state of the switch has changed due to being above the value or below the lower limit (that is, out of the range between the upper limit and the lower limit). The description “from the state where the value of the AC current component detection signal is within the range between the upper limit value and the lower limit value” means that the AC current component is stable, for example, the value of the AC current component detection signal is the upper limit value and the lower limit value. It means a state in which the state within the range of values continues for a set period (a state in which the set period has elapsed since the switch operating state has changed). Whether or not the value of the AC current component detection signal is within the range between the upper limit value and the lower limit value (whether it is greater than or equal to the upper limit value or less than the lower limit value) is determined by [lower limit value <value of AC current component detection signal] <Upper limit value> ([Upper limit value ≦ AC current component detection signal value] or [AC current component detection signal value ≦ Lower limit value]) or [Lower limit value ≦ AC current] It may be determined whether or not the value of component detection signal ≦ upper limit value ([upper limit value <value of AC current component detection signal] or [value of AC current component detection signal <lower limit value]). Whether or not the value of the AC current component detection signal is within the range between the upper limit value and the lower limit value is determined based on a shaped waveform obtained by binarizing the AC current component detection signal using the upper limit value and the lower limit value as threshold values. It is preferable to do this. If this method is used, it can be easily determined whether or not the AC current component detection signal is within the range between the upper limit value and the lower limit value. In this mode, it is determined that the operating state of the switch has changed because the value of the AC current component detection signal has become greater than or equal to the upper limit value from a state where it is less than the upper limit value, or has become less than or equal to the lower limit value. The structure to be included.
The upper limit value and the lower limit value are for preventing erroneous determination by the determination means. The upper limit value and the lower limit value are preferably values that exceed the range of the AC current component detection signal in a state where the AC current component is stable (for example, a state where a set period has elapsed since the switch operating state has changed). Set to
In this aspect, since the process of comparing the value of the alternating current component detection signal with the upper limit value and the lower limit value may be performed, it is possible to determine that the operating state of the switch has changed with a simple process.
This aspect can be suitably used when determining that the operating state of the switch has changed.

In the second aspect of determining the operating state of the switch based on the value of the AC current component detection signal, the determining means starts from the state where the value of the AC current component detection signal is within the range between the upper limit value and the lower limit value. It is determined that the operating state of the switch has changed due to the occurrence of the set number of times alternately between the state where the value is equal to or greater than the value and the state where the value is equal to or less than the lower limit value. In this case, either the state where the value of the AC current component detection signal is equal to or higher than the upper limit value or the state where the value of the AC current component detection signal is equal to or lower than the lower limit value may occur first. In addition, when counting the set number of times, the number of times the other occurred within a certain period after one of the state where the value of the AC current component detection signal was equal to or higher than the upper limit value and the state where the value was equal to or lower than the lower limit value occurred. Is preferably discriminated. The set number can be set as appropriate.
In this aspect, since the process of comparing the value of the alternating current component detection signal with the upper limit value and the lower limit value may be performed, it is possible to determine that the operating state of the switch has changed with a simple process. In addition, it is determined that the operating state of the switch has changed because the alternating current component detection signal value has exceeded the upper limit value and the lower limit value have alternately occurred a set number of times. It is possible to accurately determine that the operating state has changed.
This aspect can be suitably used when determining that the operating state of the switch has changed.

When the operating state of the switch changes, an alternating current waveform component is included in the rising or falling portion of the monitored current waveform. Here, when the switch changes from one operation state to the other operation state (for example, from an off state to an on state), the alternating current component first changes in a decreasing direction (negative direction). On the other hand, when the switch changes from the other operation state to one operation state (for example, from the on state to the off state), the alternating current component first changes in the increasing direction (positive direction). For this reason, based on the value of the alternating current component detection signal, the change state of the switch operation state, for example, the change state in which the switch changes from one operation state to the other operation state or the switch changes from one operation state to the other operation state. It is possible to determine a change mode that changes to the operating state.
In the third aspect of determining the operating state of the switch based on the value of the AC current component detection signal, the determining means starts from the state where the value of the AC current component detection signal is within the range between the upper limit value and the lower limit value. It is determined that the switch has changed from one operating state to the other operating state due to being less than or equal to the value, and the upper limit value is determined from the state where the value of the AC current component detection signal is within the range between the upper limit value and the lower limit value. As a result, it is determined that the switch has changed from one operating state to the other. In this mode, it is determined that the operating state of the switch has changed because the value of the AC current component detection signal has become greater than or equal to the upper limit value from a state where it is less than the upper limit value, or has become less than or equal to the lower limit value. The structure to be included.
In this aspect, since the process of comparing the value of the alternating current component detection signal with the upper limit value and the lower limit value may be performed, the change state of the operating state of the switch can be determined with a simple process.
This mode is a change mode of the operation state of the switch, for example, a change from one operation state to the other operation state (for example, an on state to an off state) or one operation state (for example, an off state) from the other operation state. It can be suitably used when determining that the state has changed from the state to the on state. For example, a notification switch that informs the status of a monitored device has an abnormality in the monitored device, the notification switch has changed from an off state to an on state, or the abnormality of the monitored device has recovered, and the notification switch is turned on. It can be used to determine that the state has changed to the off state.

In the fourth aspect in which the operating state of the switch is determined based on the value of the AC current component detection signal, the determination means starts with the state in which the value of the AC current component detection signal is within the range between the upper limit value and the lower limit value. After the value falls below the lower limit, it is determined that the switch has changed from one operating state to the other due to the occurrence of a set number of times alternately exceeding the upper limit and below the lower limit. Then, from the state where the value of the AC current component detection signal is within the range between the upper limit value and the lower limit value, first, after the upper limit value is exceeded, the state where the lower limit value is reached and the upper limit value are exceeded. It is determined that the switch has changed from the other operation state to the one operation state due to the occurrence of the set number of times alternately.
In this aspect, since the process of comparing the value of the alternating current component detection signal with the upper limit value and the lower limit value may be performed, the change state of the operating state of the switch can be determined with a simple process. In addition, since the state of the AC current component detection signal value exceeding the upper limit value and the state where the AC current component detection signal value is equal to or less than the lower limit value are alternately generated for the set number of times, the change mode of the switch operating state is determined. It is possible to accurately determine how the operating state changes.
This mode changes the operating state of the switch, for example, the change from one operating state to the other operating state (for example, off state to on state) or the other operating state to one operating state (for example, on state). It can be suitably used for determining that the state has changed to the off state.

As the alternating current component detecting means, it is preferable to use detecting means that can detect a minute alternating current component included in the waveform of the monitoring current without affecting other devices. In this aspect, as the alternating current component detection means, detection means constituted by a core formed in a donut shape by a magnetic material and a detection winding wound around the core is used. And the monitoring line is inserted in the space inside the core. As long as the core has a space part through which the monitoring line can be inserted and can detect the AC current component included in the waveform of the monitoring current flowing through the monitoring line in a non-contact manner, the type of magnetic material forming the core The shape of the core can be changed as appropriate. The hollow portion inside the core may be formed in a shape having an opening for facilitating the operation of inserting the monitoring line into the hollow portion, but may be formed in a shape having no opening. Also good. In this case, in order to facilitate the operation of inserting the monitoring line into the hollow portion, it is preferable to configure the core in a half-break shape.
If this aspect is used, the minute alternating current component contained in the waveform of the monitoring current can be easily detected at low cost and without contact.

Another invention of the present invention is a monitoring device including a notification switch that indicates a state of a monitored device and a switch operation state determination device that determines the operation state of the notification switch. Any one of the above-described switch operation state determination devices is used as the switch operation state determination device.
By using the monitoring device of the present invention, it is possible to determine the operation state of the notification switch (for example, change in the operation state or change state of the operation state) with a simple circuit configuration at low cost.

  By using the switch operation state discriminating apparatus of the present invention, it is possible to discriminate the switch operation state (changes in the operation state and changes in the operation state) with a simple circuit configuration at low cost. Further, by using the monitoring device of the present invention, the state of the monitored device can be monitored with a simple circuit configuration at low cost.

First, the outline of the present invention will be described.
As described above, the conventional switch operating state discriminating device detects the DC current flowing through the monitoring line connecting the switch and the DC power source, and the switch operating state changes based on the detected DC current value. It is determined whether or not. However, the direct current detecting means for detecting the direct current flowing through the monitoring line in a non-contact manner is expensive and the circuit configuration is complicated.
Here, when the operating state of the switch changes as a result of analyzing the waveform of the monitoring current flowing through the monitoring line, for example, when the switch changes from an off state (non-operating state) to an on state (operating state) or on state When the state changed from (operating state) to off state (non-operating state), as shown in FIG. 2, it was found that an alternating current component was included in the rising portion or falling portion of the monitored current waveform.
The present invention focuses on the fact that an alternating current component is included in the rising or falling portion of the waveform of the monitoring current flowing through the monitoring line when the operating state of the switch changes. That is, by detecting the alternating current waveform component included in the waveform of the monitoring current, it is possible to determine the operating state of the switch (changes in the operating state and changes in the operating state). Even when a minute alternating current component is detected in a non-contact manner, the detection means is inexpensive and the circuit configuration is simple.

Next, embodiments of the present invention will be described with reference to the drawings.
A schematic configuration of the first embodiment of the present invention is shown in FIG. In this embodiment, the communication device is a monitored unit 200, and the monitoring device 100 is configured to monitor the state of the monitored unit 200. The monitored unit 200 corresponds to the “monitored device” of the present invention.
The monitored unit 200 is provided with notification switches 210 and 220 that indicate the status of each monitored object of the monitored unit 200. In the present embodiment, a mechanical switch having fixed contacts 210a and 210b and a movable contact 210c is used as the notification switch 210. In addition, when the monitoring target corresponding to the notification switch 210 is normal, the notification switch 210 is controlled to be in an off state (non-operating state), and the contact between the movable contact 210c and the fixed contacts 210a and 210b is released (opened). On the other hand, when the monitoring target corresponding to the notification switch 210 is abnormal, the movable contact 210c is controlled to be in an on state (operating state) so that the movable contact 210c comes into contact with the fixed contacts 210a and 210b (becomes closed). It is configured. Of course, as the notification switch 210, switches having various configurations other than this can be used.

The monitoring unit 300 includes notification switch operation state determination devices 310 and 320 that determine the operation state of the notification switches 210 and 220 corresponding to the notification switches 210 and 220, respectively. Since the notification switch operation state determination devices 310 and 320 have the same configuration, the configuration of the notification switch operation state determination device 310 will be described below.
The operation state determination device 310 of the notification switch includes an alternating current component detector 311, a direct current power supply 312, a resistor 313, and a determination circuit 315.
The DC power supply 312 is connected to the notification switch 210 via the resistor 313 and the monitoring line 310a. As a result, the voltage of the DC power supply 312 is applied to the notification switch 210 via the resistor 313. The resistor 313 is for adjusting the value of the monitoring current (DC current) flowing through the monitoring line 310a.
The alternating current component detector 311 has a toroidal core 311a formed in a donut shape by a magnetic material, and a detection winding 311b wound around the toroidal core 311a. A monitoring line 310a is inserted into the space inside (center side) the toroidal core 311a. Thereby, the alternating current component detector 311 operates as a transformer having the monitoring line 310a as a primary winding and the detection winding 311b as a secondary winding. That is, the AC current component detector 311 detects the AC current component included in the waveform of the monitoring current flowing through the monitoring line 310a in a non-contact manner, and outputs an AC current component detection signal from the detection winding 311b. As the AC current component detector 311, detection means having various configurations may be used as long as the AC current component included in the rising portion or falling portion of the waveform of the monitoring current flowing through the monitoring line 310 a can be detected. it can. For example, the core around which the detection winding 311b is wound can be formed of various magnetic materials, and can be formed in various shapes as long as it has a space through which the monitoring line 310a can be inserted. The core around which the detection winding 311b is wound is preferably formed so as to have a space having an opening in order to facilitate the insertion work of the monitoring line 310a into the inner (center side) space. . In addition, although it can also form so that it may have a space which does not have an opening part, in order to make the insertion operation | work of the monitoring line 310a to space easy in this case, it is preferable to form in a half crack shape.
The determination circuit 315 determines the operating state of the notification switch 210 based on the alternating current component detection signal output from the alternating current component detector 311.
The notification switch operating state discriminating devices 310 and 320 correspond to the “switch operating state discriminating device” of the present invention, the AC current component detector 311 corresponds to the “AC current component detecting means” of the present invention, and the discriminating circuit 315. Corresponds to the “discriminating means” of the present invention.

Next, the waveform of the alternating current component included in the waveform of the monitoring current when the operating state of the notification switch 210 changes will be described with reference to FIG. Note that the upper limit value and the lower limit value shown in FIG. 2 are used to discriminate (recognize) the AC current component contained in the rising or falling portion of the monitored current waveform when the operating state of the notification switch 210 changes. belongs to. The upper limit value and the lower limit value are included in the waveform of the monitoring current when the operation state of the notification switch 210 is stable (for example, at the time when the notification switch 210 is turned on or off for a set period or more). A value larger than the maximum value and a value smaller than the minimum value of the alternating current component (noise component, etc.) to be selected are selected.
When the monitoring target corresponding to the notification switch 210 is normal, the notification switch 210 is controlled to be in an off state (non-operating state), and the contact between the movable contact 201c and the fixed contacts 210a and 210b is released. Thereby, the value of the monitoring current (DC current value) is less than the set value. Moreover, the value of the alternating current component included in the waveform of the monitoring current is within the range between the upper limit value and the lower limit value.

In this state, when an abnormality occurs in the monitoring target corresponding to the notification switch 210 at time t1, the notification switch 210 is controlled to be in an on state (operating state), and the movable contact 210c comes into contact with the fixed contacts 210a and 210b. Thereby, the value of the monitoring current (DC current value) changes from less than the set value to more than the set value. At this time, an alternating current component is included in the rising portion of the waveform of the monitoring current. The value of the alternating current component first changes in the decreasing direction (negative direction) at time t1, and then attenuates while alternately changing in the increasing direction (positive direction) and the decreasing direction (negative direction). That is, as shown in FIG. 2, at the time point t1, the value of the first wave of the alternating current component becomes lower than the lower limit value (below the upper limit value and lower limit value range), and then the value of the second wave Becomes greater than or equal to the upper limit (becomes greater than or equal to the range between the upper limit and lower limit), and then the value of the third wave is less than or equal to the lower limit. In FIG. 2, the values of the first wave to the sixth wave of the alternating current component from the time point t <b> 1 are equal to or lower than the lower limit value or higher than the upper limit value (outside the upper limit value and lower limit value range). When the notification switch 210 changes from the off state (non-operating state) to the on state (operating state) at time t1, when the set period elapses, the value of the alternating current component included in the monitored current waveform is the upper limit value and the lower limit value. It is within the range (the operation state of the notification switch 210 is stabilized). In FIG. 2, after the seventh wave of the alternating current component from the time point t1, the attenuation is within the range of the upper limit value and the lower limit value.
In this state, when the abnormality of the monitoring target corresponding to the notification switch 210 is recovered at time t11, the notification switch 210 is controlled to be in an off state (non-operating state), and the contact between the movable contact 210c and the fixed contacts 210a and 210b is performed. Canceled. As a result, the value of the monitoring current (DC current value) changes from the set value or more to less than the set value. At this time, an alternating current component is included in the falling portion of the monitoring current waveform. The value of the alternating current component first changes in the increasing direction (positive direction) at time t11, and then attenuates while alternately changing in the decreasing direction (negative direction) and the increasing direction (positive direction). That is, as shown in FIG. 2, at the time point t11, the value of the first wave of the alternating current component becomes equal to or higher than the upper limit value, then the value of the second wave becomes equal to or lower than the lower limit value, and then the third The wave value is above the upper limit. In FIG. 2, the values of the first wave to the sixth wave of the alternating current component from the time point t11 are equal to or lower than the lower limit value or equal to or higher than the upper limit value (out of the range between the upper limit value and the lower limit value). When the notification switch 210 changes from the on state (operating state) to the off state (non-operating state) at time t11, the value of the alternating current component included in the monitored current waveform becomes the upper limit value and the lower limit value. Within range. In FIG. 2, from the time point t11, after the seventh wave of the alternating current component, it is attenuated within the range of the upper limit value and the lower limit value.

When the operating state of the notification switch 210 changes, the alternating current component included in the waveform of the monitoring current flowing through the monitoring line 310a changes as described above. Therefore, the determination circuit 315 is output from the alternating current component detector 311. Based on the value of the alternating current component detection signal, the operating state of the notification switch 210 can be determined by various methods.
Below, the aspect which discriminate | determines the operation state of the alerting | reporting switch 210 based on the value of the alternating current component detection signal output from the alternating current component detector 311 is demonstrated.

(First discrimination mode)
As described above, when the notification switch 210 changes from the off state (non-operating state) to the on state (operating state) or changes from the on state (operating state) to the off state (non-operating state), An alternating current component is included in the rising portion or falling portion of the waveform. That is, when the notification switch 210 changes from the off state to the on state or changes from the on state to the off state, the value of the alternating current component detection signal output from the alternating current component detector 311 is greater than or equal to the upper limit value and the lower limit value. Varies between: On the other hand, when the operating state of the notification switch 210 is stable, the waveform of the monitoring current does not include an alternating current component. That is, when the operating state of the notification switch 210 is not changed, the value of the AC current component detection signal output from the AC current component detector 311 is within the range between the upper limit value and the lower limit value.
In the first discrimination mode of the discrimination circuit 315, the value of the AC current component detection signal output from the AC current component detector 311 changes between the lower limit value and the upper limit value. It is determined that the operating state has changed (from an off state to an on state or from an on state to an off state).
The first determination mode can be suitably used when determining that the operating state of the notification switch 210 has changed. For example, when the monitoring target corresponding to the notification switch 210 is normal, it is in an off state (non-operational state), and when the monitoring target becomes abnormal, the operation of the notification switch 210 is in an on state (operational state). It can be used when determining a change in state. In this case, by determining that the operating state of the notification switch 210 has changed, the notification switch 210 has changed from the off state to the on state, that is, the monitoring target corresponding to the notification switch 210 is abnormal. Can be determined. Alternatively, for example, it can be used to determine the current operating state of the notification switch 210 that is off in the initial state. In this case, based on the operation state (off state or on state) of the notification switch 210 in the initial state and the number of changes in the operation state of the notification switch 210, is the current operation state of the notification switch 210 (whether it is in the on state)? Whether it is in the off state).

(Second discrimination mode)
As described above, when the notification switch 210 is changed from the off state to the on state, or when the notification switch 210 is changed from the o state to the off state, the alternating current component included in the waveform of the monitoring current decreases at least once (negative direction). And it changes in the increasing direction (positive direction). That is, when the notification switch 210 changes from the off state to the on state or from the on state to the off state, the value of the AC current component detection signal falls within the range between the upper limit value and the lower limit value and is at least once below the lower limit value or the upper limit value. Change to more than the value.
In the second discrimination mode of the discrimination circuit 315, the value of the AC current component detection signal output from the AC current component detector 311 is in the range between the upper limit value and the lower limit value (the operation of the notification switch 210 is stabilized). The operation state of the notification switch 210 has changed (for example, from an off state to an on state or from an on state to an off state). ).
Similar to the first determination mode, the second determination mode can be suitably used when determining that the operating state of the notification switch 210 has changed.

(Third discrimination mode)
As described above, when the notification switch 210 changes from the off state to the on state, or when the notification switch 210 changes from the on state to the off state, the alternating current component included in the waveform of the monitoring current changes in the decreasing direction (negative direction). And the change in the increasing direction (positive direction) is performed alternately. That is, when the notification switch 210 changes from the off state to the on state or from the on state to the off state, the value of the AC current component detection signal falls within the range between the upper limit value and the lower limit value and is lower than the lower limit value. Attenuates while the state exceeding the value changes alternately.
In the third discrimination mode of the discrimination circuit 315, the value of the AC current component detection signal output from the AC current component detector 311 is in the range between the upper limit value and the lower limit value (the operation of the notification switch 210 is stabilized). The state of the notification switch 210 is changed (for example, from the off state to the on state or the Discriminating from the on state to the off state). In this case, either the state where the value of the alternating current component detection signal is equal to or lower than the lower limit value or the state where the value is equal to or higher than the upper limit value may occur first.
Similar to the first determination mode, the third determination mode can be suitably used when determining that the operating state of the notification switch 210 has changed.
An appropriate value can be set as the set number of times.
The third determination mode can more reliably determine that the operating state of the notification switch 210 has changed than the second determination mode.

(Fourth discrimination mode)
As described above, when the notification switch 210 changes from the off state to the on state, the alternating current component included in the waveform of the monitoring current first changes in the decreasing direction (negative direction). That is, when the notification switch 210 changes from the off state to the on state, the value of the alternating current component detection signal changes from within the upper limit value and the lower limit value to below the lower limit value. On the other hand, when the notification switch 210 changes from the on state to the off state, the alternating current component included in the waveform of the monitoring current first changes in the increasing direction (positive direction). That is, when the notification switch 210 changes from the on state to the off state, the value of the alternating current component detection signal changes from the upper limit value and the lower limit value to the upper limit value or more.
In the fourth determination mode of the determination circuit 315, the value of the AC current component detection signal output from the AC current component detector 311 is in the range between the upper limit value and the lower limit value (the operation of the notification switch 210 is stabilized). It is determined that the notification switch 210 has changed from one operating state to the other operating state when the lower limit value is reached. For example, it is determined that the notification switch 210 has changed from an off state to an on state. On the other hand, from the state where the value of the alternating current component detection signal output from the alternating current component detector 311 is within the range between the upper limit value and the lower limit value (the state where the operation of the notification switch 210 is stable), the upper limit value is exceeded. Thus, it is determined that the notification switch 210 has changed from the other state to one state. For example, it is determined that the notification switch 210 has changed from an on state to an off state.
The fourth determination mode can be suitably used when determining the change mode of the operating state of the notification switch 210. When this determination mode is used, the current operating state of the notification switch 210 can be easily determined.

(Fifth discrimination mode)
As described above, when the notification switch 210 changes from the off state to the on state, the alternating current component included in the waveform of the monitoring current first changes in the decreasing direction (negative direction), and then increases (positive) Direction) and attenuating while alternately changing in the decreasing direction (negative direction). That is, when the notification switch 210 changes from the OFF state to the ON state, the value of the AC current component detection signal output from the AC current component detector 311 is first within the range between the upper limit value and the lower limit value, and below the lower limit value. After that, a state where the value is equal to or higher than the upper limit value and a state where the value is equal to or lower than the lower limit value occur alternately several times. On the other hand, when the notification switch 210 changes from the on state to the off state, the alternating current component included in the waveform of the monitoring current first changes in the increasing direction (positive direction), and then decreases (negative direction) and Attenuating while alternately changing in the increasing direction (positive direction). That is, when the notification switch 210 changes from the on-state to the off-state, the value of the alternating current component detection signal output from the alternating current component detector 311 first exceeds the upper limit value within the range between the upper limit value and the lower limit value. After that, a state where the value is lower than the lower limit and a state where the value is higher than the upper limit occur alternately several times.
In the fifth discrimination mode of the discrimination circuit 315, the value of the AC current component detection signal output from the AC current component detector 311 is in the range between the upper limit value and the lower limit value (the operation of the notification switch 210 is stabilized). State), the state where the state became equal to or greater than the upper limit value and the state equal to or less than the lower limit value occurred after a set number of times later, so that the notification switch 210 changes from one operating state to the other. It is determined that the operating state has been changed. For example, it is determined that the notification switch 210 has changed from an off state to an on state. On the other hand, from the state where the value of the alternating current component detection signal output from the alternating current component detector 311 is within the range between the upper limit value and the lower limit value (the state where the operation of the notification switch 210 is stable), the upper limit value is exceeded. After that, it is determined that the notification switch 210 has changed from the other operation state to the one operation state due to the occurrence of the set number of times alternately between the state below the lower limit and the state above the upper limit. . For example, it is determined that the notification switch 210 has changed from an on state to an off state.
An appropriate value can be set as the set number of times.
The fifth determination mode can be used when the fourth determination mode is used to determine the change mode of the operating state of the notification switch 210 as in the fourth determination mode. The determination can be made more reliably than in the fourth determination mode.
The fifth determination mode can more reliably determine the change mode of the operating state of the notification switch 210 than the fourth determination mode.

In the first embodiment, the discriminating circuit 315 determines the operating state of the notification switch 210 (changes in operating state and changes in operating state) based on the AC current detection signal output from the AC current component detector 311. Determined. Here, as a method for determining whether or not the value of the AC current component detection signal is within the range between the upper limit value and the lower limit value (or whether the value is outside the range between the upper limit value and the lower limit value), an AC current is used. It is preferable to use a method of discriminating components based on a shaped waveform binarized using an upper limit value and a lower limit value as threshold values.
A monitoring apparatus according to the second embodiment using the waveform shaping circuit 314 is shown in FIG.
In the second embodiment shown in FIG. 3, the AC current component detection signal detected by the AC current component detector 311 (output from the detection winding 311b) is discriminated via the waveform shaping circuit 314. The configuration is the same as that of the monitoring apparatus according to the first embodiment except that the input is input to.
The waveform shaping circuit 314 outputs a shaped waveform obtained by binarizing the input alternating current component detection signal with the upper limit value and the lower limit value as threshold values. For example, as shown in FIG. 4, the waveform shaping circuit 314 compares the value of the AC current component detection signal with the upper limit value and the lower limit value, and the value of the AC current component detection signal is within the range between the upper limit value and the lower limit value. In this case, a binary signal of “H” level is output, and when it is outside the range between the upper limit value and the lower limit value (when it is greater than or equal to the upper limit value or less than the lower limit value), an “H” level binary signal is output.
Based on the shaping waveform output from the waveform shaping circuit 315, the determination circuit 315 determines whether or not the state where the value of the AC current component detection signal is equal to or lower than the lower limit value and the state where the value is equal to or higher than the upper limit value occur alternately. Then, it is determined whether the value of the alternating current component detection signal is lower than the lower limit value or higher than the upper limit value. Thereby, the process of the 1st discrimination | determination aspect-3rd discrimination | determination aspect mentioned above can be performed.
In order to execute the processes of the fourth discrimination mode and the fifth discrimination mode described above, a signal indicating whether the value of the AC current component detection signal is initially lower than the lower limit value or higher than the upper limit value is used. It is necessary to input to the discrimination circuit.

The present invention is not limited to the configuration described in the embodiment, and various changes, additions, and deletions are possible.
As the notification switch 210, switches having various configurations can be used as long as an alternating current component is included in the rising portion or falling portion of the monitored current waveform when the operating state changes.
The monitoring device of the present invention can be configured as a monitoring device that monitors the status of various monitored devices.
In the embodiment, the monitoring device is configured. However, the present invention can also be configured as a switch operation state determination device.
As a method for determining the operation state of the switch based on the alternating current component detection signal, the method described in the embodiment (based on the comparison result between the value of the alternating current component detection signal and at least one of the upper limit value and the lower limit value). The determination method is not limited to various methods, and various methods can be used.
The configurations described in the embodiments can be used alone or in combination with a plurality of appropriately selected configurations.

1 is a diagram showing a schematic configuration of a first embodiment of the present invention. FIG. 3 is a diagram showing waveforms of respective parts in the first embodiment of the present invention. It is a figure which shows schematic structure of the 2nd Embodiment of this invention. It is a figure which shows the waveform of each part of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Monitoring apparatus 200 Monitored part 210,220 Notification switch 210a, 210b Fixed contact 210c Movable contact 300 Monitoring part 310,320 Operation state discrimination device 310a of notification switch Monitoring line 311 AC current component detector (AC current component detection means)
311a Toroidal core 311b Detection winding 312 DC power supply 313 Resistance 314 Waveform shaping circuit (waveform shaping means)
315 Discrimination circuit (discrimination means)

Claims (7)

An apparatus for determining an operating state of a switch for determining an operating state of the switch,
A DC power supply connected to the switch via a monitoring line;
AC current component detection means for detecting an AC current component included in the monitoring current flowing through the monitoring line and outputting an AC current component detection signal;
A discriminator for discriminating that the operating state of the switch has changed based on an AC current component detection signal output from the AC current component detector;
An apparatus for determining an operating state of a switch.   The switch operating state determination device according to claim 1, wherein the determination unit is configured to detect the alternating current component detection signal from a state where the value of the alternating current component detection signal is within a range between an upper limit value and a lower limit value. A switch operating state discriminating apparatus characterized by discriminating that the operating state of the switch has changed due to a value exceeding an upper limit value or less than a lower limit value.   3. The switch operating state determination device according to claim 2, wherein the determination unit is configured to detect the alternating current component detection signal from a state in which a value of the alternating current component detection signal is within a range between an upper limit value and a lower limit value. An apparatus for determining an operating state of a switch, characterized in that it determines that the operating state of the switch has changed due to the occurrence of a set number of times alternately when a value is equal to or greater than an upper limit value and a state where a value is equal to or less than a lower limit value.   The switch operating state determination device according to claim 1, wherein the determination unit is configured to detect the alternating current component detection signal from a state where the value of the alternating current component detection signal is within a range between an upper limit value and a lower limit value. A state in which the switch has changed from one operating state to the other operating state because the value is equal to or lower than the lower limit value, and the value of the AC current component detection signal is within the range between the upper limit value and the lower limit value From the above, it is determined that the switch has changed from the other operation state to the one operation state when the value of the alternating current component detection signal is equal to or greater than the upper limit value.   The switch operating state determination device according to claim 4, wherein the determination unit is configured to detect the alternating current component detection signal from a state where the value of the alternating current component detection signal is within a range between an upper limit value and a lower limit value. After the value became less than or equal to the lower limit value, the switch changed from one operating state to the other operating state due to the occurrence of a set number of times that the state that became the upper limit value or more and the state that became the lower limit value or less occurred alternately. From the state where the value of the alternating current component detection signal is within the range between the upper limit value and the lower limit value, the value of the alternating current component detection signal becomes equal to or lower than the lower limit value after the value becomes equal to or higher than the upper limit value. An apparatus for determining an operating state of a switch, wherein the switch determines that the switch has changed from the other operating state to the one operating state due to the occurrence of a set number of times alternately between the remaining state and the upper limit value.   6. The switch operation state determination device according to claim 1, wherein the alternating current component detection means includes a core formed in a donut shape by a magnetic material, and a detection winding wound around the core. The switch operating state discriminating apparatus, wherein the monitoring line is inserted into a space inside the core.   7. A monitoring device comprising a notification switch indicating a state of a monitored device and an operation state determination device for a switch for determining an operation state of the notification switch, wherein the switch operation state determination device is any one of claims 1 to 6. A monitoring device using the switch operating state determination device according to claim 1.

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