JP2956048B2 - Power monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply monitoring device for detecting an abnormality in a power supply voltage such as a spike or a momentary interruption that may affect the operation of a device.

[0002]

2. Description of the Related Art As a conventional power supply monitoring device, AC / D
For example, 5V on the DC side (secondary side) of the C converter
In general, the DC power supply voltage is monitored for abnormalities.
As such a power supply monitoring device, one in which a time constant circuit, a voltage comparator, and the like are integrated is commercially available, and is provided in many personal computers and workstations.

[0003]

When only the voltage on the secondary side is monitored as in a conventional power supply monitoring apparatus, it is possible to detect a power failure or a voltage abnormality for a relatively long time. It is difficult to detect the AC side (primary side) of the AC / DC converter, that is, the voltage abnormality of the commercial power supply for a relatively short time. For example, if a voltage abnormality of several tens of milliseconds occurs on the primary side, such as a momentary voltage interruption or spike, this will not be detected by the conventional power supply monitoring device that monitors only the secondary side voltage. May cause problems such as destroying the contents of the storage device.

In general, a momentary interruption or spike of a commercial power supply recovers to its original state in a very short time. Therefore, for example, even if a power failure occurs on the primary side when the workstation automatically performs long-term processing and the workstation malfunctions due to damage to stored data, the primary The power supply voltage on the primary side immediately returns to the original state, so even if the operator later discovers an abnormal operation of the workstation, the power supply voltage on the primary side has already returned to normal, and the secondary power supply monitoring device has No abnormality is detected, and it is expected that the cause of the operation abnormality of the workstation cannot be specified after all. In such a case, identify whether this workstation malfunction was due to a problem in the workstation itself, a malfunction in the secondary power circuit, or a malfunction in the primary commercial power supply. If not, it is difficult to take appropriate measures thereafter.

[0005] By the way, a dedicated device for detecting an abnormality in the power supply on the primary side has been conventionally known, but such a device is very expensive and large-sized, so that installation is not easy. Furthermore, there are many inconveniences, such as the need for a specialized operator to analyze an abnormality detected by such a device, and the power supply voltage cannot be easily monitored anywhere.

The present invention has been made based on the above circumstances, and provides a power supply monitoring device capable of easily detecting a short-time voltage abnormality such as an instantaneous interruption or a spike in a commercial power supply with a simple device. It is intended for.

[0007]

According to a first aspect of the present invention, there is provided an A / D converter for obtaining primary side voltage data obtained by digitizing an AC voltage on a primary side of a power supply circuit.
Converting means, first storage means for storing reference data relating to a normal voltage, and performing predetermined processing on the primary side voltage data and the reference data, and comparing the both to compare the primary side AC voltage on the primary side of the power supply circuit. And an abnormality detecting unit for detecting the abnormality of the above.

According to a second aspect of the present invention, in the first aspect of the present invention, the abnormality detecting section has a calculating means and a comparing and judging means, and the calculating means determines whether the primary side voltage data and the reference data are effective. A value is obtained, and a difference value between the primary-side voltage data and the reference data is obtained, and the comparing and judging means, when the difference value exceeds a predetermined value,
The primary voltage data is compared with an effective value of the reference data.

According to a third aspect of the present invention, in the first or second aspect of the invention, the reference data stored in the first storage means can be changed by an external operation. Things.

According to a fourth aspect of the present invention, in the first or second aspect of the invention, the reference data stored in the first storage means includes an AC voltage waveform on a primary side of the power supply circuit over a predetermined period. It is obtained by sampling and performing predetermined processing as needed.

The invention according to claim 5 is the invention according to claims 1, 2, 3
Alternatively, in the invention described in Item 4, when the abnormality detecting section detects an abnormality in the primary-side AC voltage, the abnormality detecting section has second storage means for storing data relating to the abnormal voltage.

[0012]

According to the first aspect of the present invention, A / A
Both the primary-side voltage data obtained by the D conversion means and the reference data stored in the first storage means are digital signals, and the abnormality detection unit can easily perform processing such as calculation and comparison of data values. be able to. As a result of these processes and comparison, if there is a difference exceeding a predetermined value between the primary side voltage data and the reference data, it can be considered that the voltage on the primary side of the power supply circuit is abnormal. When the abnormality detecting section detects such an abnormality, it outputs a predetermined signal to notify that an abnormality has occurred in the power supply voltage on the primary side.

According to the second aspect of the present invention,
The abnormality detection unit includes a calculation unit and a comparison determination unit. The effective value obtained by the calculating means is an average voltage for one cycle of the sine waveform. Therefore, by using not only the difference value but also the effective value to detect the voltage abnormality, it is possible to judge that an extremely short-time voltage fluctuation or an instantaneous interruption near the zero crossing that is unlikely to affect the equipment is abnormal. Instead, it is possible to selectively detect only an abnormality that is likely to cause an abnormality in the device.

According to a third aspect of the present invention, there is provided
Appropriate reference data to be compared with the power supply voltage can be externally set according to the type of equipment connected to the AC power supply line, the status of the AC power supply line, and the like.

According to the fourth aspect of the present invention,
Since the apparatus automatically samples the reference data stored in the storage means from the normal state of the power supply, there is no need for the operator to set a signal waveform in advance, and the power supply voltage may fluctuate slightly with time. However, by performing sampling at regular time intervals, it is possible to prevent this temporal variation from being determined to be abnormal.

According to a fifth aspect of the present invention, there is provided
By storing the data relating to the abnormal voltage in the second storage means, the detected abnormality can be analyzed later, and can be referred to when taking necessary measures.

[0017]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a power supply monitoring device as an example of the present invention, FIG. 2 is a schematic configuration diagram of a workstation incorporating the power supply monitoring device of FIG. 1, and FIGS. 3 to 5 are based on the power supply monitoring device of FIG. FIG. 6 is a schematic configuration diagram of the configured power supply monitoring module, and FIG. 6 is a schematic configuration diagram of a processor system incorporating the power supply monitoring module.

In FIG. 1, an AC power supply line 12 is a normal 50 Hz or 60 Hz 100 V commercial power supply line. The voltage on the AC power supply line 12 draws a sine waveform having an effective value of 100 V in a normal state, but voltage abnormalities such as instantaneous interruption and spikes often occur due to various causes. Such a voltage abnormality has an adverse effect on a personal computer, a work station, or the like that is supplied with power from the AC power supply line 12, and in some cases, may destroy the storage contents of a magnetic storage device, a semiconductor memory, or the like. .

The power supply monitoring device 10 shown in FIG. 1 is connected to the AC power supply line 12 to detect the above-described voltage abnormality, and constantly performs the voltage abnormality detection operation. The power supply monitoring device 10 captures a voltage for which abnormality is to be detected by the AC power supply capturing unit 14. This voltage is full-wave rectified by the rectifier 16 and converted into a digital signal by the A / D converter 18. The digital signal is sent to the signal processing unit 20, where an operation for obtaining an effective value is performed. The processed signal is usually sent to the comparison / determination unit 22, but is taken in by the sampling unit 24 when obtaining reference data.

The sampling section 24 takes in data from the signal processing section 20 at predetermined intervals and uses this as reference data. However, the voltage abnormality cannot be detected unless the reference data is accurate. Therefore, in order to compare this data with the ideal waveform, the ideal waveform generator 28 of FIG. 1 stores the effective value of the ideal waveform. If the sampled data deviates from this ideal waveform, another data is newly sampled. The determination in this case is taken in consideration of a temporal voltage fluctuation described later, except for a case where there is a significant deviation.

Next, the operation of the power supply monitoring device 10 of FIG. 1 will be described with reference to the flowchart of FIG.
To monitor the power supply voltage abnormality, first, in step S1
Creates reference data for a reference waveform. In the present embodiment, a method of creating reference data relating to the reference waveform is such that a normal voltage waveform is sampled from the AC power supply line 12 for one cycle by the sampling unit 24, stored in the memory 26, and used as the reference waveform. But,
If necessary, an operator can write data of a predetermined voltage waveform to the memory 26 via the setting tap 34 from outside. The rated voltage of the AC power line 12 is 100V
However, there are some fluctuations over the long term. In order not to consider such time-dependent voltage fluctuations as abnormal,
In the power supply monitoring device of FIG. 1, for example, this voltage is sampled at intervals of 10 minutes, and the reference data is updated.

In step S2 in FIG. 2, a voltage waveform for detecting an abnormality is fetched from the AC power supply line 12 by the AC power supply unit 14, and full-wave rectification is performed by the rectification unit. The rectified voltage waveform is D
The signal is converted into a digital signal by the / A converter 18. Here, for example, 64 samples are used per cycle, and quantization is performed with 8 bits per sample.

The voltage data thus converted into a digital signal is sent to the signal processing unit 20. In step S4, the signal processing unit 20 shown in FIG. 1 digitally compares the reference waveform and the actual voltage waveform to obtain a difference value. Step S
In step 5, it is determined whether or not the difference value has exceeded a predetermined value for, for example, 10 consecutive samples. In step S6, the ratio of the effective value of the voltage waveform including the data to the effective value of the reference waveform is determined. This operation is performed in the comparison / determination unit 22 of FIG. As described above, the calculation of the effective value as well as the difference value is performed, for example, even if the difference value becomes a large value to some extent, for example, the effective value is not so large, such as a momentary interruption near the zero point. If there is no large fluctuation, there is almost no effect on the equipment.Therefore, if only the difference value is simply calculated, even if the voltage fluctuation is such that there is no problem in the operation of the equipment, an abnormal alarm will be issued frequently and abnormal This is because there is no point in performing the detection.

If the ratio of the effective value exceeds the second predetermined value, it is determined in step S7 that the power supply voltage is abnormal, and a signal to that effect is sent to the FAIL output 32. Further, in step S8, the abnormal voltage data is stored in the memory 30 of FIG. This is because it is necessary to know what kind of abnormality has occurred when examining the contents of the voltage abnormality later and taking necessary countermeasures. Done through.

Incidentally, in the block diagram of FIG.
Whether to provide 0, the FAIL output 32, and the setting tap 34 can be arbitrarily determined according to each situation.

The operation after step S10 in the flowchart of FIG. 2 is an operation for detecting when the voltage on the AC power supply line 12 is not a short-time abnormality such as an instantaneous interruption or a spike, but fluctuates as a whole. . Specifically, in step S10, the effective value of the voltage is obtained for about one minute, and in step S11, this is compared with a preset threshold to detect an abnormality. Here, for example, when the effective value of the power supply voltage drops to about 80 V, it is determined to be abnormal, and a signal to that effect is output in step S12.

Next, the power supply monitoring module shown in FIGS. 3 to 5 will be described. These are configured based on the power supply monitoring device of FIG. Power supply monitoring module 40 of FIG.
Is a device configured to minimize the function of simply detecting a voltage abnormality of an AC power supply line, and only the FAIL signal output tap 42 is provided as the terminal 32 in FIG. The AC power input tap 44 is connected to the AC power line 12 in FIG. FAIL signal output tap 42
Is supplied from the comparison / determination unit 22 of FIG. FA
The signal from the IL signal output tap 42 is supplied to control means such as a computer, for example.
It can be configured to emit an alarm sound or to turn on an alarm lamp when a signal is output. The apparatus of FIG. 3 merely informs that an abnormal voltage has occurred, and has a limited function. However, in a situation where it is desired to know only the presence or absence of an abnormal voltage, the purpose of detecting abnormality can be achieved with a simple apparatus.

The power supply monitoring module 50 shown in FIG. 4 is obtained by adding a detection level setting tap 34 and an ALARM signal output tap 54 to the apparatus shown in FIG. The detection level setting tap 34 is connected to the memory 26 shown in FIG. 1. By supplying a predetermined signal to the detection level setting tap 34, the operator can externally rewrite the contents of the memory 26 and change the setting of the reference data. Also, a plurality of reference data can be set as needed.

The reason why the ALARM signal output tap 54 is provided in the power supply monitoring module of FIG. 4 is to output a signal to the FAIL signal output tap 42 or the ALARM signal output tap 54 according to the condition of the voltage abnormality. The FAIL signal is output when an abnormality occurs such that the device cannot operate normally. On the other hand, the ALARM signal is output when a relatively minor abnormality occurs. The ALARM signal has a role of notifying an operator or the like that the quality of the power supply is degraded even if the signal does not immediately become abnormal.

The power supply monitoring module 60 shown in FIG. 5 is obtained by adding an abnormal data output tap 36 to the apparatus shown in FIG. The abnormal data output tap 36 is connected to the memory 30 of FIG.
And a tap for taking out the contents when a voltage abnormality occurs and the data is stored in the memory 30 of FIG. The abnormal data output tap 36 is connected to control means such as a personal computer, for example, and the data is read out via the control means, whereby the contents of the voltage abnormality can be analyzed.

FIG. 6 is a schematic configuration diagram of a processor system 70 in which any one of the power supply monitoring modules shown in FIGS. 3 to 5 is incorporated. The processor system 70 is, for example, a personal computer or the like, and the power supply monitoring module 72 is provided in a power supply unit inside the housing. In addition to the power supply monitoring module 72, the processor system of FIG. 6 is provided with a power supply monitoring module 76 that monitors the voltage on the secondary side of the AC / DC converter 74. That is, the power supply monitoring module 72 monitors the abnormal voltage of the commercial power supply, and the power supply monitoring module 76
This is for monitoring an abnormal voltage of the DC power supply on the secondary side via the DC converter 74.

By providing the power supply monitoring modules 72 and 76 on both the primary side and the secondary side of the AC / DC converter 74 as described above, when an operation abnormality occurs in the personal computer, the cause is the primary power supply. It can be determined whether the error is due to an abnormality, a power supply abnormality on the secondary side, or an abnormality in the personal computer itself. The outputs of the power supply monitoring modules 72 and 76 are connected to the self-diagnosis unit 78 of the personal computer, and when the power supply monitoring module 72 issues a FAIL signal or an ALARM signal or when the power supply monitoring module 76 issues a similar signal. , And displays the contents of the abnormality on a display device such as the CRT 80 as necessary. Further, if necessary, the result of the abnormality can be stored in the storage unit 82 such as a RAM, and the data can be used for analyzing the content of the abnormality. If the operation abnormality is a primary-side power supply abnormality, appropriate measures can be taken, such as moving to another power supply line or performing necessary construction to prevent the abnormality from occurring.

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made within the scope of the invention.

[0034]

As described above, according to the present invention, an A / D converter for converting an AC voltage waveform on the primary side into a digital signal.
An AC power supply comprising a conversion means, a first storage means for storing reference data relating to a normal voltage, and an abnormality detection section for detecting a primary-side voltage abnormality from the digitized primary-side voltage data and reference data. Voltage abnormalities that cannot be detected by the secondary-side DC voltage monitoring device, such as spikes and instantaneous interruptions that occur in the line, can be easily detected. It is possible to provide a power supply monitoring device that makes it easy to investigate the cause of an abnormal operation and take necessary measures.

According to the second aspect of the present invention, in addition to the above effects, the arithmetic unit not only obtains the difference between the digitized primary-side voltage data and the reference data, but also obtains the effective values of both. By comparing the effective value only when the difference value exceeds a predetermined value, when an abnormality determination is performed only by the difference value, a voltage change that does not actually affect the device is determined to be abnormal. It is possible to provide a power supply monitoring device capable of effectively preventing the occurrence of a power supply voltage abnormality on the primary side.

According to the third aspect of the present invention, in addition to the above-described effects, since the reference data can be changed by an external operation, appropriate reference data can be set according to the state of the AC power supply line or the equipment. Since the power supply monitoring device can be changed, it is possible to provide a power supply monitoring device capable of detecting a primary power supply voltage abnormality with high flexibility.

According to the fourth aspect of the present invention, in addition to the above-described effects, the reference data is obtained by sampling the AC voltage waveform on the primary side of the power supply circuit for a predetermined period and performing predetermined processing as necessary. Since the reference data is automatically created and set without setting the reference data, it is possible to provide a power supply monitoring device that can be easily used even by persons without special knowledge.

According to the fifth aspect of the invention, in addition to the above effects, when an abnormality is detected in the power supply voltage on the primary side,
By storing the data in the second storage means, the data can be read out as necessary to analyze the contents of the abnormality, and when the specific abnormality of the AC power supply line occurs frequently, the predetermined value can be obtained. It is possible to provide a power supply monitoring device that can easily perform measures such as taking measures.

[Brief description of the drawings]

FIG. 1 is a block diagram of a power supply monitoring device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation of the power supply monitoring device of FIG. 1;

FIG. 3 is a schematic configuration diagram of a simple power supply monitoring module configured based on the power supply monitoring device of FIG. 1;

FIG. 4 is a schematic configuration diagram of a power supply monitoring module having a detection level setting tap configured based on the power supply monitoring device of FIG. 1;

FIG. 5 is a schematic configuration diagram of a power supply monitoring module having an abnormal data output tap configured based on the power supply monitoring device of FIG. 1;

FIG. 6 is a schematic configuration diagram of a processor system incorporating a power supply monitoring module.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Power supply monitoring apparatus 12 AC power supply line 14 AC power supply intake part 16 Rectifier part 18 A / D conversion part 18 20 Signal processing part 22 Comparison judgment part 24 Sampling part 26, 30 Memory 32 FAIL output 34 Setting tap 36 Abnormal data output tap 40 , 50, 60, 70 Power supply monitoring module 54 ALARM signal output tap 74 AC / DC converter 76 Secondary power supply monitoring module 78 Self-diagnosis unit 80 CRT 82 Storage unit

Claims (2)

(57) [Claims] An A / D converter for obtaining primary voltage data obtained by digitizing an AC voltage on a primary side of a power supply circuit, a first storage for storing reference data relating to a normal voltage, and the primary voltage data And an abnormality detection unit that performs a predetermined process on the reference data and compares the two to detect an abnormality in the AC voltage on the primary side of the power supply circuit, wherein the abnormality detection unit includes a calculation unit and a comparison determination unit. Wherein the calculating means obtains an effective value of the primary-side voltage data and the reference data, obtains a difference value between the primary-side voltage data and the reference data, and the comparison / determination means comprises: A power supply monitoring device, wherein when the power supply voltage exceeds a predetermined value, the primary side voltage data is compared with the effective value of the reference data. 2. An A / D converter for obtaining primary-side voltage data obtained by digitizing an AC voltage on a primary side of a power supply circuit, based on a value obtained by sampling an AC voltage waveform on the primary side of the power supply circuit over a predetermined period. First storage means for storing the created reference data, performing predetermined processing on the primary-side voltage data and the reference data, and comparing both to detect an abnormality in the AC voltage on the primary side of the power supply circuit A power supply monitoring device, comprising: an abnormality detection unit that performs the operation.