JP2024034881A - Detection device, detection method, and detection program - Google Patents

Abstract

An object of the present invention is to detect a disconnection in a relatively short measurement cycle without causing errors due to the influence of charging voltage. A detection device 10 includes a charging section 12a, a measuring section 12b, a determining section 12c, and a discharging section 12d. The charging unit 12a periodically charges the capacitor of the internal filter. The measurement unit 12b measures the voltage of the capacitor after charging by the charging unit 12a and the voltage of the capacitor after a certain period of time has elapsed after charging. The determination unit 12c determines whether or not a disconnection has occurred based on the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has passed after charging. The discharging unit 12d discharges the capacitor when the determining unit 12c determines that there is no disconnection. [Selection diagram] Figure 2

Description

The present invention relates to a detection device, a detection method, and a detection program.

Conventionally, there is a known technique for detecting a wire breakage by comparing a recorded value obtained by AD converting a thermocouple input with a recorded value after a certain period of time has elapsed after charging by a wire breakage detection power supply (for example, , Patent Document 1). Also known is a technique for detecting disconnection by periodically charging a small amount of charge to the capacitor of the internal filter and measuring whether or not it is discharged.

Japanese Patent Application Publication No. 03-156981

However, with the above-mentioned conventional technology, if the voltage is not measured after it has been sufficiently discharged, the measurement value will be affected by the charging voltage and an error will occur. Unless it is done later, correct measurements for wire breakage detection cannot be made, and the measurement cycle for wire breakage detection cannot be made faster.

In order to solve the above problems and achieve the purpose, the detection device of the present invention includes a charging section that periodically charges the capacitor of the internal filter, a voltage of the capacitor after charging by the charging section, and a constant voltage after charging. a measurement unit that measures the voltage of the capacitor after a lapse of time; a determination unit that determines whether or not a disconnection has occurred based on the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has passed after charging; and a discharging section that discharges the capacitor when the determining section determines that there is no disconnection.

According to the present invention, it is possible to detect a disconnection in a relatively short measurement cycle without causing an error due to the influence of charging voltage.

FIG. 1 is a diagram showing an overview of detection processing according to an embodiment. FIG. 2 is a block diagram showing the configuration of the detection device according to the embodiment. FIG. 3 is a diagram illustrating a method for determining a disconnection in the detection process according to the embodiment. FIG. 4 is a flowchart showing the flow of detection processing in the detection device according to the embodiment. FIG. 5 is a diagram illustrating an example of a computer that executes a detection program.

Embodiments of a detection device, a detection method, and a detection program according to the present application will be described in detail below based on the drawings. Note that the detection device, detection method, and detection program according to the present application are not limited to this embodiment.

[1. System configuration example]
FIG. 1 is a diagram showing an overview of detection processing according to this embodiment. The detection device 10 periodically charges the capacitor of the internal filter. Then, the detection device 10 determines whether or not a disconnection has occurred based on the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has passed after charging. Thereafter, when the detection device 10 determines that no disconnection has occurred, the detection device 10 discharges the capacitor.

The detection device 10 first periodically charges the capacitor of the internal filter. For example, the detection device 10 periodically charges the capacitor of the input RC filter for a certain period of time from a constant current circuit or the like. Next, the detection device 10 measures the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has passed after charging. For example, the detection device 10 measures the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has passed after charging, by performing AD conversion on each.

Then, the detection device 10 determines whether or not a disconnection has occurred based on the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has passed after charging. For example, the detection device 10 compares the voltage of the capacitor after charging with the voltage of the capacitor after a certain period of time has elapsed after charging, and if both voltages are equal, it determines that a disconnection has occurred, and the voltage of the capacitor after charging is If the voltage of the capacitor is low after a certain period of time after charging, it is determined that there is no disconnection.

Thereafter, when the detection device 10 determines that no disconnection has occurred, the detection device 10 discharges the capacitor. For example, when the detection device 10 determines that a disconnection has not occurred through the above-described processing, it discharges the charged capacitor of the input RC filter according to the charged charge.

In this way, the detection device 10 charges the capacitor of the internal filter, measures the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has elapsed after charging, and compares both voltages to detect a disconnection. After determining whether or not a disconnection has occurred, if it is determined that a disconnection has not occurred, the capacitor is discharged according to the charged electric charge. As a result, the detection device 10 can detect wire breakage in a relatively short measurement cycle without causing errors due to the influence of charging voltage.

[2. Configuration of detection device 10]
Next, with reference to FIG. 2, the configuration of the detection device 10 shown in FIG. 1 will be described. FIG. 2 is a diagram illustrating a configuration example of a detection device according to an embodiment. As shown in FIG. 2, the detection device 10 according to the embodiment includes an input section 11, a control section 12, and a storage section 13.

The input section 11 is realized by, for example, an input RC filter. The input unit 11 is an interface that accepts input signals from the outside.

The storage unit 13 is realized, for example, by a storage device such as a RAM (Random Access Memory) or a hard disk. The storage unit 13 stores data and programs necessary for various processing by the control unit 12, and includes a setting information storage unit 13a and a measurement information storage unit 13b, which are particularly closely related to the present invention.

The setting information storage unit 13a stores setting information used in detection processing described later. For example, the setting information storage section 13a stores the charging time by the charging section 12a, which will be described later, a certain period of time when the measuring section 12b measures the voltage of the capacitor after a certain period of time has elapsed after charging, and the cycle at which charging is performed by the charging section 12a. Stores setting information used in detection processing such as.

It is assumed that the aforementioned setting information is stored in advance in the setting information storage section 13a before the detection process is performed. Further, the cycle at which the charging section 12a performs charging is set in consideration of the time during which discharging by the discharging section 12d, which will be described later, is completed and all the electric charges charged by the charging section 12a are discharged.

The measurement information storage unit 13b stores a measured value of the capacitor voltage measured by the measurement unit 12b, which will be described later. For example, the measurement information storage unit 13b stores, as a measurement value, a value obtained by AD converting the voltage of the capacitor after charging and after a certain period of time has passed after charging, which is measured by the measurement unit 12b described later.

The control unit 12 is realized by a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or the like executing various programs stored in a storage device inside the detection device 10 using a RAM as a work area. Further, the control unit 12 is realized by, for example, an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). The control section 12 includes a charging section 12a, a measuring section 12b, a determining section 12c, and a discharging section 12d.

The charging unit 12a periodically charges the capacitor of the internal filter. For example, the charging unit 12a refers to the charging time stored in the setting information storage unit 13a described above from a constant current circuit or the like, and charges the capacitor of the input RC filter. The charging unit 12a then periodically charges the capacitor by referring to the charging cycle stored in the setting information storage unit 13a.

The measurement unit 12b measures the voltage of the capacitor after being charged by the charging unit 12a and the voltage of the capacitor after a certain period of time has elapsed after charging. The measurement unit 12b then stores the measured value in the measurement information storage unit 13b. For example, the measurement unit 12b refers to a certain time at the time of measurement stored in the setting information storage unit 13a, and calculates the voltage of the capacitor after being charged by the charging unit 12a and the voltage of the capacitor after a certain period of time has elapsed after charging. , the respective AD-converted values are stored in the measurement information storage section 13b as measurement values.

Furthermore, the measurement unit 12b may measure the voltage of the capacitor before charging. The measurement unit 12b then stores the measured value in the measurement information storage unit 13b. For example, the measurement unit 12b stores a value obtained by AD converting the voltage of the capacitor before charging by the charging unit 12a as a measurement value in the measurement information storage unit 13b.

The determination unit 12c determines whether or not a disconnection has occurred based on the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has passed after charging. Then, when determining that a disconnection has not occurred, the determining unit 12c notifies the discharging unit 12d of the determination result.

For example, the determination unit 12c compares the measured value of the voltage of the capacitor after charging, which is stored in the measurement information storage unit 13b, and the measured value of the voltage of the capacitor after a certain period of time has elapsed after charging, and if both measured values are If they are equal, it is determined that a disconnection has occurred, and if the measured value of the capacitor voltage after a certain period of time after charging is lower than the measured value of the capacitor voltage after charging, it is determined that a disconnection has not occurred. . Then, when determining that a disconnection has not occurred, the determining unit 12c notifies the discharging unit 12d of the determination result.

The discharging unit 12d discharges the capacitor when the determining unit 12c determines that there is no disconnection. For example, the discharging unit 12d discharges the charged capacitor in response to a notification from the above-mentioned determining unit 12c of the determination result that the disconnection has not occurred.

Further, the discharging section 12d may determine the time to discharge the capacitor according to each voltage measured by the measuring section 12b. For example, the discharging unit 12d calculates the difference between the measured values before and after charging and the measured value after charging, based on the measured value before charging, the measured value after charging, and the measured value after a certain period of time after charging, which are stored in the measurement information storage unit 13b. Based on the ratio calculated from the difference between the measured value after a certain period of time and the measured value before charging, the time to discharge the capacitor is determined so that the voltage of the capacitor becomes equal to the voltage of the capacitor before charging. .

Note that if the discharge circuit included in the discharge section 12d is a constant current circuit, the amount of discharge is proportional to the discharge time, so the amount of discharge is determined by the discharge time. By calculating the exponent, the time for discharging the capacitor can be determined.

[3. Specific example of information processing]
Here, with reference to FIG. 3, a specific example of the determination process of determining whether a disconnection has occurred after the charging process by the detection device 10 and the process of determining the discharge time in the discharging process will be described. FIG. 3 is a diagram illustrating a method for determining a disconnection in the detection process according to the embodiment.

First, the measurement unit 12b measures the voltage of the capacitor before charging. In the example of FIG. 3, Va is the measured value of the voltage of the capacitor before charging, and the measured value is set to "0". Next, the charging section 12a charges the capacitor, and the measuring section 12b measures the voltage of the capacitor after charging. In the example of FIG. 3, Vb is the measured value of the voltage of the capacitor after charging, and Vb becomes a value of "1" due to the charging process.

Then, the measurement unit 12b measures the voltage of the capacitor after a certain period of time has passed after charging. In the example of FIG. 3, the time when the charging process is completed is set as "0", and the time after a certain period of time has passed after charging is set as "0.7" (dotted line in the graph of FIG. 3). In the example of FIG. 3, the measured value after a certain period of time has elapsed after charging when there is no wire breakage is set as Vc, and the measured value after a certain period of time has elapsed after charging when there is a wire breakage is set as Vc'.

Here, if there is no disconnection in the input wiring, the voltage of the capacitor will gradually discharge as time passes after charging, so the measured value Vc after a certain period of time after charging will be around "0.5". value. On the other hand, if there is a break in the input wiring, the voltage of the capacitor will not be discharged even after a certain period of time has passed after charging, and the measured value Vc' after a certain period of time after charging will be "1", the same as Vb. Become.

Thereafter, the determining unit 12c determines whether or not a wire breakage has occurred by comparing the measured value Vb after charging with the measured value Vc or Vc' after a certain period of time has elapsed after charging. As mentioned above, the measured value Vc after a certain period of time after charging when there is no disconnection is around "0.5", so it is lower than the measured value Vb after charging, which is "1". Therefore, the determination unit 12c determines that there is no disconnection, and notifies the discharge unit 12d of the determination result.

On the other hand, as mentioned above, the measured value Vc' after a certain period of time after charging when a disconnection occurs is "1", so it must be the same value as the measured value Vb after charging, which is "1". From this, the determination unit 12c determines that a disconnection has occurred.

Then, when it is determined that there is no disconnection, the discharge section 12d discharges the capacitor. In the example of FIG. 3, the discharging unit 12d discharges the capacitor based on the notification from the determining unit 12c so that the value of Vc “0.5” becomes the same as the voltage Va “0” before charging. Here, the discharging unit 12d is configured to adjust the voltage of the capacitor to the voltage before charging based on a ratio calculated from the difference between the measured values before and after charging, the difference between the measured value after a certain period of time after charging, and the measured value before charging. Determine the time to discharge the capacitor so that it equals the voltage of the capacitor.

In the example of FIG. 3, the difference between the measured values before and after charging is Vb-Va, which is "1-0=1". Further, the difference between the measured value after a certain period of time after charging and the measured value before charging is Vc-Va, which is "0.5-0=0.5". Therefore, the discharge section 12d operates for half the charging time due to the calculated ratio of Vb-Va "1" and Vc-Va "0.5", "1:0.5=2:1". The capacitor voltage after discharging becomes the same value as the capacitor voltage Va "0" before charging.

Due to the above-mentioned discharging process, the voltage of the capacitor after discharging becomes the same value as the voltage of the capacitor before charging, so the detection process can be repeated at any time after the time "0.75" after discharging. Can be done. On the other hand, if the discharge process is not performed, it will take a long time for the voltage of the capacitor after charging to become equal to the voltage of the capacitor before charging, and even at time "3.75" in the graph of FIG. A difference occurs between the two voltages, and this difference causes a measurement error, making it impossible to perform accurate detection processing.

Through the series of processes described above, the detection device 10 detects a disconnection by comparing the measured value of the voltage of the capacitor after charging with the measured value of the voltage of the capacitor after a certain period of time has elapsed after charging, and detects the disconnection. If not, by discharging immediately, the disconnection can be detected in a relatively short measurement cycle without causing errors due to the influence of charging voltage.

[4. An example of detection processing by a detection device]
Next, the detection processing of the detection device 10 will be explained using FIG. 4. FIG. 4 is a flowchart showing the flow of detection processing in the detection device according to the embodiment. The detection device 10 receives, for example, an input signal (step S101).

When the detection device 10 receives the input signal (step S101; Yes), the charging unit 12a charges the capacitor of the internal filter (step S102). On the other hand, if the detection device 10 has not received an input signal (step S101; No), it waits until it receives an input signal.

Then, the measurement unit 12b measures the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has passed after charging (step S103). After that, the determination unit 12c determines whether or not a disconnection has occurred (step S104). If it is determined that a disconnection has occurred (step S104; Yes), the detection device 10 stops the detection process (step S105). On the other hand, if it is determined that there is no disconnection (step S104; No), the discharge unit 12d discharges the capacitor (step S106). Then, the detection device 10 returns to step S102 and continues the process.

[5. Effects of embodiment]
As described above, the detection device 10 according to the present embodiment includes a charging unit 12a that periodically charges a capacitor of an internal filter, a voltage of the capacitor after being charged by the charging unit 12a, and a voltage of the capacitor after a certain period of time has passed after charging. a measuring unit 12b that measures the voltage of the capacitor; a determining unit 12c that determines whether a disconnection has occurred based on the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has elapsed after charging; A discharging section 12d is provided that discharges the capacitor when the determining section 12c determines that a disconnection has not occurred.

The charging unit 12a charges the capacitor of the internal filter for a preset time using a constant current circuit or the like. Further, the measurement unit 12b measures, as a measurement value, a value obtained by AD converting the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has passed after charging. Furthermore, the determination unit 12c determines whether or not a disconnection has occurred by comparing the measured value of the voltage of the capacitor after charging with the measured value of the voltage of the capacitor after a certain period of time has passed after charging. Furthermore, when it is determined that a disconnection has occurred, the discharging unit 12d discharges the capacitor so that the voltage of the capacitor becomes the value before charging.

As a result, the detection device 10 detects a break in the capacitor by comparing the voltage of the capacitor after charging with the voltage of the capacitor after a certain period of time has elapsed after charging, and immediately detects a break in the capacitor even if there is no break in the capacitor. By discharging the battery, it is possible to detect a disconnection in a relatively short measurement period without causing an error due to the influence of the charging voltage.

Furthermore, the measuring section 12b of the detecting device 10 measures the voltage of the capacitor before charging, and the discharging section 12d of the detecting device 10 determines the time for discharging the capacitor according to each measured voltage. As a result, the detection device 10 determines the discharge time from the measured value of the voltage of the capacitor at each point in time, so that the amount of discharge can be controlled by time allocation regardless of the difference in capacitor capacity. .

[6. Hardware configuration]
The aforementioned detection device 10 according to the present embodiment is realized by, for example, a computer 1000 having a configuration as shown in FIG. 5. FIG. 5 is a hardware configuration diagram showing an example of a computer that implements the functions of the detection device 10. The computer 1000 has a configuration in which a CPU 1100, a RAM 1200, a ROM 1300, an auxiliary storage device 1400, a communication I/F (interface) 1500, and an input/output I/F (interface) 1600 are connected by a bus 1800.

CPU 1100 operates based on a program stored in ROM 1300 or auxiliary storage device 1400, and controls each section. The ROM 1300 stores a boot program executed by the CPU 1100 when the computer 1000 is started, programs depending on the hardware of the computer 1000, and the like.

Auxiliary storage device 1400 stores programs executed by CPU 1100, data used by the programs, and the like. Communication I/F 1500 receives data from other devices via a predetermined communication network and sends it to CPU 1100, and transmits data generated by CPU 1100 to other devices via the predetermined communication network.

The CPU 1100 controls an output device such as a display or a printer, and an input/output device 1700 such as a keyboard or mouse via an input/output I/F 1600. CPU 1100 acquires data from input/output device 1700 via input/output I/F 1600. Further, the CPU 1100 outputs the generated data to the input/output device 1700 via the input/output I/F 1600.

For example, when the computer 1000 functions as the detection device 10 according to the present embodiment, the CPU 1100 of the computer 1000 realizes the functions of the control unit 12 by executing a program loaded onto the RAM 1200.

[7. others]
Among the processes described in the above embodiments, all or part of the processes described as being performed automatically can be performed manually, or all of the processes described as being performed manually can be performed manually. Alternatively, some of the steps can be performed automatically using known methods. In addition, information including the processing procedures, specific names, and various data and parameters shown in the above documents and drawings may be changed arbitrarily, unless otherwise specified. For example, the various information shown in each figure is not limited to the illustrated information.

Further, each component of each device shown in the drawings is functionally conceptual, and does not necessarily need to be physically configured as shown in the drawings. In other words, the specific form of distributing and integrating each device is not limited to what is shown in the diagram, and all or part of the devices can be functionally or physically distributed or integrated in arbitrary units depending on various loads, usage conditions, etc. Can be integrated and configured.

The above-mentioned components include those that can be easily imagined by those skilled in the art, those that are substantially the same, and those that are in the so-called equivalent range. Further, the embodiments described above can be combined as appropriate within a range that does not conflict with the processing contents.

Further, the above-mentioned "section, module, unit" can be read as "means", "circuit", etc. For example, the control section can be read as a control means or a control circuit.

Some of the embodiments of the present invention have been described above in detail based on the drawings, but these are merely examples, and various modifications may be made based on the knowledge of those skilled in the art, including the embodiments described in the disclosure section of the invention. However, it is possible to implement the present invention in other forms with improvements.

10 Detection device 11 Input section 12 Control section 12a Charging section 12b Measuring section 12c Judgment section 12d Discharging section 13 Storage section 13a Setting information storage section 13b Measurement information storage section

Claims (4)

A charging section that periodically charges the internal filter capacitor,
a measurement unit that measures the voltage of the capacitor after being charged by the charging unit and the voltage of the capacitor after a certain period of time has passed after charging;
a determination unit that determines whether a disconnection has occurred based on the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has passed after charging;
and a discharging section that discharges the capacitor when the determining section determines that a disconnection has not occurred. The measurement unit measures the voltage of the capacitor before charging,
The detection device according to claim 1, wherein the discharge section determines the time for discharging the capacitor according to each voltage measured by the measurement section. A detection processing step executed by a detection device,
A charging process that periodically charges the capacitor of the internal filter,
a measuring step of measuring the voltage of the capacitor after charging in the charging step and the voltage of the capacitor after a certain period of time has elapsed after charging;
a determination step of determining whether a disconnection has occurred based on the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has passed after charging;
and a discharging step of discharging the capacitor if it is determined in the determining step that a disconnection has not occurred. A charging procedure that periodically charges the internal filter capacitor,
a measurement procedure of measuring the voltage of the capacitor after charging by the charging procedure and the voltage of the capacitor after a certain period of time has passed after charging;
a determination procedure of determining whether a disconnection has occurred based on the voltage of the capacitor after charging and the voltage of the capacitor after a certain period of time has passed after charging;
and a discharging procedure for discharging the capacitor when it is determined that a wire breakage has not occurred in the determination procedure.

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