JP2000253598A - Apparatus and method for monitoring digital data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To convert digital data used as a control signal into analog data to be displayed, in equipment using a microcomputer. SOLUTION: Digital data are sampled by a storage/communication control circuit 14 to be transmitted and stored in storage devices 15-18. The stored data is transmitted to a display 20 to be displayed after converted into analog data. While the digital data stored in the storage devices 15-18 is transmitted to the display 20, new digital data are not sampled by the storage/ communication control circuit 14. After the transmission of the digital data to the display 20 is finished, sampling of new digital data is started by the storage/communication control circuit 14. Storing and displaying timings of the digital data under specified conditions can be set with the use of an input device 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling a digital data by using a microprocessor (hereinafter abbreviated as "microcomputer"), and to an apparatus and method for converting the digital data into an analog signal. .

[0002]

2. Description of the Related Art Conventionally, various control devices have been constituted by a combination of analog circuit components such as a resistor, a capacitor, and an operational amplifier. However, with the high performance and low cost of the microcomputer, it has become possible to replace these components with the microcomputer and software. As a result, the performance of various control devices has been improved, the number of components can be reduced, and miniaturization and cost reduction have been achieved.

In a conventional control device using analog circuit components such as a resistor, a capacitor, and an operational amplifier,
Using a measuring instrument such as an oscilloscope, the operating status of each of these components could be confirmed in analog fashion by touching the joint between the components with the probe. However, with a recent control device using the microcomputer and the program described above, it is difficult to confirm whether or not each component is operating normally by simple means. In other words, since a control device using a microcomputer processes digital data by transmission and reception, even if errors such as overflow or underflow have occurred between components, the status of these errors is analogously abnormal. There is a problem that cannot be determined.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to convert digital data between components processed in a microcomputer into an analog signal and monitor the digital data so that an error such as overflow or underflow of the digital data occurs. It is an object of the present invention to provide an apparatus and a method capable of determining whether or not the operation is performed.

[0005]

According to a first aspect of the present invention, there is provided a digital data monitoring apparatus for controlling a device by digital data using a microprocessor, wherein the digital data is sampled and stored. A storage / communication control circuit for transferring to the device, a storage device for storing digital data transferred from the storage / communication control circuit, a communication port for transferring the digital data stored in the storage device to a display device, A display device for converting the digital data transferred from the communication port into an analog display.

According to a second aspect of the present invention, the control of the storage / communication control circuit, the storage device, and the communication port according to the first aspect is performed by a determination circuit.

In the third invention, the operation condition of the determination circuit is such that data is input from an input device to a display device, the input data is converted into digital data in the display device, and then transferred to a communication port. It is characterized in that the digital data is transferred from a communication port to a determination circuit and stored therein.

According to a fourth aspect of the present invention, the apparatus according to any one of the first to third aspects of the present invention for controlling a device by digital data using the microprocessor is an uninterruptible power supply using an inverter.

According to a fifth aspect of the present invention, in a method of monitoring digital data of an apparatus for controlling a device with digital data using a microprocessor, the digital data to be used for the control is sampled and stored, and the stored digital data is converted into an analog signal. It is a method of monitoring digital data to be displayed in a digitized form.

In the sixth invention, while transmitting the digital data to the display device, the sampling of the new digital data is interrupted, and after the transmission is completed,
The digital data monitoring method according to claim 5, wherein the digital data is sampled again.

According to a seventh aspect of the present invention, the condition for determining whether to store the digital data according to the fifth or sixth aspect and whether to display the data in an analog form is set by an input device. is there.

[0012]

FIG. 1 shows an embodiment in which the present invention is applied to an uninterruptible power supply using an inverter controlled by a microcomputer. The uninterruptible power supply generally operates as described below. That is, commercial power 1
Is used as input power, and the voltage monitoring circuit 2 monitors the voltage of the commercial power supply 1. The voltage monitoring circuit 2 detects the voltage of the commercial power supply 1
In the range of 90 to 110 V, the switch circuit 3 is switched to output the electric power of the commercial power supply 1 to the load 4 as it is, and the charger 5 is operated to charge the lead storage battery 6.

On the other hand, when the voltage of the commercial power
When the voltage becomes 0 V or more, the voltage of the commercial power supply 1 is determined to be abnormal, and the switch circuit 3 is switched to switch the commercial power supply 1 to the load 4.
While stopping the output to the battery and charging the lead storage battery 6,
Activate the inverter 7 using the lead-acid battery 6 as a power source to load 4
To supply power.

The inverter 7 operates instantaneously when the voltage of the commercial power supply 1 becomes 90 V or less or 110 V or more, and the quality of the output voltage waveform is excellent (for example, 100 V / 50 Hz). Sine wave) is strongly required. In order to satisfy these conditions,
An inverter control unit 8 composed of various circuit components is attached to 7. Each component of the inverter control unit 8 is controlled by a microcomputer. The present invention provides an inverter control unit 8 which displays whether digital data between components constituting the inverter control unit 8 indicates a normal state in an analog manner, is less susceptible to disturbances such as noise, and has a low cost. It is something that can be achieved in. Further, the timing of data to be displayed in an analog manner can be freely set by the input device 30.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIG.

(Embodiment 1) This embodiment 1 allows an uninterruptible power supply to make an analog determination as to whether or not the control of the inverter 7 is operating properly.

The output voltage of the inverter 7 is supplied to the A / D converter 9
Is converted into digital data. On the other hand, reference sine wave number table 10 stores data of a reference voltage waveform (for example, a sine wave of 100 V / 50 Hz). A deviation processing circuit 11 calculates a deviation between the data of the output voltage of the inverter 7 digitized through the A / D converter 9 and the waveform stored in the reference sine wave number table 10. Output to The inverter drive operation circuit 12 calculates the control condition of the inverter 7 so as to reduce the deviation between the data digitized through the A / D converter 9 and the waveform stored in the reference sine wave number table 10. And
The control condition that optimizes the operation of the inverter 7 is defined by I
The signal is output from the / O port 13 to the inverter 7.

Since the various control signals used between these components are all digitized signals, it is difficult to intuitively understand whether or not those signals are in a normal range. According to the present invention, these digital data are converted into analog data by the following means and displayed.
That is, after various digital data output from the A / D converter 9, the reference sine wave number table 10, the deviation processing circuit 11, and the inverter drive arithmetic circuit 12 are sampled by the storage / communication control circuit 14, these are sampled by the storage device 15 To 18 in order and store them. The digital data stored in the storage devices 15 to 18 is output to a display device 20 such as a personal computer through the communication port 19, converted into an analog signal, and displayed. In addition, as a display format, a numerical display and a graphical display that is easy to understand may be used in combination. By using this method, digital data of each part of the inverter control unit 8 can be displayed in an analog manner, so that it can be easily understood whether or not those parts are in a normal state.

While the digital data stored in the storage devices 15 to 18 is being output to the display device 20 through the communication port 19, the storage / communication control circuit 14 stops sampling the digital data, that is, exclusive control. We use a dynamic control method. In addition, display conditions are stored in the determination circuit 31 from the input device 30 such as a personal computer keyboard via the display device 20 and the communication port 19, and are stored in the storage devices 15 to 18 according to an instruction of the determination circuit 31. The digital data of the next step can be sequentially output to the display device 20.

The output waveform of the inverter 7 is preferably a sine wave. For example, when one cycle of the 50 Hz sine wave voltage is graphed and displayed on the display device 20 such as a personal computer, one cycle of the sine wave is divided into 144 pieces, and the voltage at each is digitized and continuously. It was confirmed that the output could be judged to be a smooth sine curve as far as the eye could see. Therefore, this time, the storage devices 15-18
One cycle of the sine wave of Hz was divided into 144 pieces of digital data and stored.

Note that for a 50 Hz sine wave, the time for one cycle is
0.02 seconds. Therefore, the storage devices 15 to 18
A storage / communication control circuit 1 for storing four data
The sampling rate of 4 was 7,200 Hz. Also storage device
By providing 15-18, digital data can be stored
Since the data can be held, the transmission speed to the display device 20 such as a personal computer through the communication port 19 can be reduced to 4,800 bps. Therefore, malfunctions due to high frequency noise and the like during transmission can be extremely reduced. Further, since the number of parts can be reduced by using the present invention, the cost of the apparatus can be reduced.

(Embodiment 2) After detecting a power failure, when the power is supplied from the inverter 7 using the lead storage battery 6 as a power source, the output waveform of the inverter 7 is displayed in an analog manner. A detailed description will be given.

The contents to be displayed on the display device 20 (for example, the operation status of the inverter 7 after a power failure) are input from the input device 30 and transmitted through the communication port 19 of the inverter control unit 8 and stored in the determination circuit 31. . Specifically, the input device 30
From the power outage to the display device 20, the data is converted to digital data by the display device 20, and the digital data is transferred to the determination circuit 31 via the communication port 19 and stored. Let it. This processing in the microcomputer sets the flag. If there is a power failure, the information is output from the voltage monitoring circuit 2 to the determination circuit 31, and if the flag is set, the operation status of the inverter 7 is displayed on the display device 20.

That is, the storage / communication control circuit 14 stores the digital data in the storage device when no power failure occurs.
The digital data is transferred to 15 to 18 for storage, and the stored digital data is erased in order from the oldest one. Therefore, the communication port 19 does not transmit the digital data to the display device 20. And "blackout"
Occurs, the signal from the determination circuit 31
After storing some digital data (for example, the above-mentioned 144 digital data) in the storage devices 15 to 18, the new storage operation is stopped. Then, the storage devices 15 to 18 wait for the stored digital data to be transmitted from the communication port 19 to the display device 20. As a result, it is possible to display and confirm in an analog manner how the output waveform of the inverter 7 has a shape immediately after the power failure or how the output waveform changes.

In the second embodiment, the display of the output waveform of the inverter 7 immediately after a power failure has been described. However, if a code is arranged between the input device 30 and the inverter control unit 8, "power recovery" , “Sudden load change” or “Lead storage battery 6
In the display device 20, changes in digital data in various cases, such as “voltage drop situation”, can be confirmed.

In the above-mentioned (Embodiment 1) and (Embodiment 2), an example in which the present invention is applied to an uninterruptible power supply has been described. However, the present invention can be applied to other devices using a microcomputer. be able to. For example, the present invention can be used for motor control of a cart such as a golf cart, inverter and temperature control of home electric appliances such as an air conditioner, and control and monitoring of voltage and current in an industrial power supply device.

[0027]

As described above, when the present invention is used, digital data used as a control signal inside the microcomputer of an apparatus for controlling a device with digital data using the microcomputer can be displayed in an analog form. It is possible to visually determine whether or not the operation status of each part is normal. Therefore, even if there is any abnormality inside the microcomputer, it is easy to find out.
The present invention is also excellent in that it has high noise resistance performance and low cost. Furthermore, since the setting of the storage and display timing of the digital data can be changed by the input device, it is not necessary to add a new component even when the display content is changed.

[Brief description of the drawings]

FIG. 1 is a block diagram in which the present invention is used in an uninterruptible power supply.

[Explanation of symbols]

1: commercial power supply, 2: voltage monitoring circuit, 3: switch circuit, 4: load, 5: charger, 6: lead storage battery, 7: inverter, 8: inverter control unit, 9: A / D converter, Reference sine wave number table, 11: deviation processing circuit, 1
2: inverter drive amount calculation circuit, 13: I / O port, 14: storage / communication control circuit, 15-18: storage device, 19: communication port, 20: display device, 21: diode, 30: input device, 31 : Judgment circuit.

Claims (7)

[Claims] A storage / communication control circuit for sampling digital data and transferring it to a storage device, wherein the storage / communication control circuit is a digital data monitoring apparatus for controlling a device with digital data using a microprocessor. Storage device for storing digital data transferred from the storage device, a communication port for transferring the digital data stored in the storage device to a display device, and a display for converting the digital data transferred from the communication port into an analog form for display A monitoring device for digital data, comprising a device. 2. The digital data monitoring device according to claim 1, wherein the control of the storage / communication control circuit, the storage device, and the communication port is performed by a determination circuit. 3. The operating condition of the determination circuit is as follows: data is input from an input device to a display device, the input device converts the input data into digital data, and then transfers the digital data to a communication port. 3. The digital data monitoring device according to claim 2, wherein the digital data is transferred to a determination circuit and stored. 4. An uninterruptible power supply using an inverter, wherein the device for controlling a device with digital data using the microprocessor is an uninterruptible power supply using an inverter.
Digital data monitoring device as described. 5. A digital data monitoring method for an apparatus for controlling a device by digital data using a microprocessor, wherein the digital data to be used for the control is sampled and stored, and the stored digital data is displayed in an analog form. A method for monitoring digital data. 6. While sampling the stored digital data to a display device, suspend sampling of new digital data, and sample the digital data again after the transmission is completed. The method for monitoring digital data according to claim 5, wherein: 7. The digital data monitoring method according to claim 5, wherein a condition for determining whether to store the digital data and whether to display the digital data is set by an input device. .