JPS61200476A - High speed developing and automatic recording apparatus therefor - Google Patents

Abstract

PURPOSE:To draw the peak value of high speed development in a state superposed to the wave form of low speed development in a short recording length, by recording data by the line connecting the max. value and min. value of each expanded sampling interval at the time of the generation of abnormality. CONSTITUTION:An input signal being a commercial AC current source wave form is inputted to an AD converter 13 operated at a sample rate 2,048 times power source frequency through a transformer 11 and an amplifier 12, and a max. value detection circuit 14 and a min. value detection circuit 15 detect the max. value and min. value of AD conversion data while only the max. value and min. value of each of 32 sample data are stored in a register 16. A microprocessor 182 stores data in RAM181 and repeats operation for calculating an effective value from continuous 32 data to always monitor input AC voltage. When a calculated result exceeds a set limit, the microprocessor 182 judges abnormality and wave form data is drawn on the basis of the max. value and min. value at every 32 sample data (expanded sample intervals) by a dot printer 184. In this case, recording is performed by the line connecting the max. value and the min. value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-speed phenomenon automatic recording device for recording high-speed phenomena such as electrical waveforms.

[Conventional technology]

Conventionally, various devices have been proposed as recording devices for abnormal waveforms such as spike waveform S1 and momentary interruption waveform S2 as shown in FIG. 2 in power distribution lines, etc., depending on the place of use, purpose, etc. , a typical example is the fourth
There is a structure shown in FIG. 5 and FIG.

The device shown in FIG. 4 includes an input amplifier 41, a servo amplifier 42,
A galvanometer 43, a pen 44 fixed to its shaft, a platen 46 driven by a paper feed motor 45, and a position sensor 47 that detects the angular position of the galvanometer 43.
This is a continuous recording type pen recorder consisting of a servo amplifier 42 which converts the signal input to the terminal T to an appropriate level by an amplifier 41, uses this signal as a position command signal, and uses the output of a position detector 47 as a feedback signal. The rotation angle of the galvanometer 430 from the reference position is made proportional to the amplitude of the input signal, and a waveform with an amplitude proportional to the input is continuously recorded on the recording paper sent by the platen 46 by the pen 44 rotating together with the galvanometer 43. It has become.

The apparatus of FIG. 5 also includes an amplifier 51. A digital recorder consisting of an A/D (analog-digital) converter 52, a memory (RAM) 53, a microprocessor 54, a printer driver 55, and a dot printer 56. The input signal is converted to an appropriate level by an amplifier 51, and the signal is is converted into a digital signal at a constant sample rate,
The dot printer 56 may be stored directly in the memory 53 or with the intervention of the microprocessor 54 and the dot printer 56 may be operated by the printer driver 25 under the control of the microprocessor 540.
While converting the data stored in the dot printer 56 into dot positions, each sample data is recorded as a point on the record.

[Problem that the invention seeks to solve]

However, the continuous recording type pen recorder described above can fully demonstrate its intended function when the input signal frequency is relatively low or its change is gradual, but when the input signal frequency is about 100 Hz, Is it more than or equal to
It cannot be used when recording signal changes that require a response speed faster than several hundred milliseconds to one millisecond.

Furthermore, in a conventional digital recorder as shown in FIG. 2, one dot in the time axis direction of the dot printer 560 does not correspond to one data sandal of the A/D converter 52; Capturing and drawing signals that exhibit sudden changes requires a faster sample rate and a large memory capacity, and the number of time-dots recorded becomes extremely large, resulting in extremely long recording lengths and recording times. In this case, by slowing down the sampling rate, i.e. by increasing the sampling interval T as shown in Figure 3, the recording length can be shortened, but the step where the black circle points are the sample values is not possible. A waveform like the one shown in FIG.

However, today, as various devices based on digital operation such as personal computers have become widespread,
It is known that spikes and momentary interruptions that occur in power supply systems cause malfunctions of these devices, and countermeasures are required. Under these circumstances, it is considered extremely important to capture and analyze transient phenomena and abnormal waveforms as accurately as possible in order to investigate the cause, and there is a need for a recording device for this purpose.

This invention was made in view of the above-mentioned circumstances, and its purpose is to provide a high-speed phenomenon recording device that can record the peak value of a high-speed phenomenon superimposed on the waveform of a low-speed phenomenon with a short recording length. .

[Means for solving problems]

In order to solve the above problems, the present invention provides an analog-to-digital (A/D) converter for converting an input signal into a digital signal.
) converter; temporary storage means for storing the outputs of the maximum value detection circuit and the minimum value detection circuit until updated by the outputs of these circuits in the next extended sampling interval; Timing control means for controlling the operation timings of the value detection circuit, the minimum value detection circuit, and the temporary storage means; storing the contents each time the register is updated; and outputting the contents of the memory as a visible waveform. A waveform output means performs a predetermined calculation based on the output data of the register, and when the result deviates from a predetermined steady condition, outputs the contents of the memory and the output data of the register for an appropriate time thereafter. The present invention provides a data processing means having a control device for causing a waveform output means to output a line connecting the maximum value and the lowest value of an extended sampling interval, and a high-speed phenomenon automatic recording device as described in I).

[For production]

In the high-speed phenomenon automatic recording device of the present invention having the above-mentioned configuration, an analog input signal from a power source, etc. to be observed or analyzed is converted to an appropriate level.
/D converter performs high-speed sampling at a frequency of 2000 times the input signal frequency and converts it into a digital signal. The maximum value detection circuit and the minimum value detection circuit detect a maximum value and a minimum value each time a predetermined number of sample data is supplied from the A/D converter, that is, at each extended sampling interval, and store the detected values in registers, respectively. let The contents of the register are successively updated by the maximum and minimum values of subsequent extended sampling periods, and each update is stored in the memory of the data processing unit.

The contents of the memory are sequentially erased from the oldest each time new data is input.

The control device constantly monitors the occurrence of abnormal events in the force signal by performing predetermined calculations on the output data of the register, and when it determines that an abnormality has occurred, it activates the waveform output means and stores it in the memory. The contents of and data for an appropriate time thereafter are outputted by a line connecting the maximum value and minimum value of each extended sampling interval.

〔Example〕

Hereinafter, one embodiment of the high-speed phenomenon automatic recording device of the present invention will be described with reference to FIG.

The high-speed phenomenon automatic recording device shown in Fig. 1 consists of an insulating transformer 11
, amplifier 12, A/D converter 13, maximum value detection circuit 1
4. Consists of a minimum value detection circuit 15, a register 16 as a temporary storage means, a timing controller 17 as a timing control means, and a data processing section 18. The data processing section 18 includes a memory (RAM) 181, a microprocessor 182 and its It is comprised of a read-only memory (ROM) 183 for control programs, a dot printer 184 as a waveform output means, a printer driver 185 for driving the same, a display device 188, a keyboard 186, and a clock circuit 187.

Next, the operation of the high-speed phenomenon automatic recording device of the above embodiment will be explained.
A case will be described in which the waveform of a commercial AC power source of 0/200V and so/5oz is recorded.

The input signal is applied to an amplifier 12 via a transformer 11, converted to an appropriate signal level, and input to an A/D converter 13. The A/D converter 13 operates under the control of the timing controller 17 at a sample rate of the power supply frequency (50H! or 60Hz), that is, 2048 times the input signal frequency. The maximum value detection circuit 14 and the minimum value detection circuit 15 have a function of detecting the maximum value and minimum value of A/D converted data and holding the data, and under the control of the timing controller 17, continuously The maximum value and minimum value among the 32 samples output from the A/D converter 13 are held.

Every time the A/D converter 13 operates for 321 m, the maximum value data and minimum value data generated during this opening are set in the register 16. Therefore, only the maximum value, minimum value, and value of each 32 sample data are stored in the register 16, and this operation is repeated every time the A/D converter 13 operates 32 times.
The contents of register 16 are updated. In other words, the update rate of the register 16 is 64 (2048/32
) times.

The microprocessor 182 reads the contents of the register 16 every time they are updated and stores them in the RAMI 8↑. The contents of RAMI 81 are sequentially updated by erasing the oldest data each time new data is read. On the other hand, the microprocessor 182 uses the RAM 18
1, and each set of maximum value and minimum value output from register 6 is regarded as 1 data, and consecutive 3
Calculate the average of the absolute values using 2 data or 64 data, that is, the data of the end cycle or 1 cycle of the power supply frequency,
By repeating the operation of converting into an effective value, the presence or absence of a change in shape is also monitored.

In the RAMI 81, the starting condition 1' of the dot printer 184, the upper and lower limits of the AC/input voltage, and the permissible limit of the waveform change rate are set by the keyboard 186, and the above calculation results and the waveform change rate are set. If these set limits are exceeded, the microprocessor 182 determines that it is "abnormal" and, after an appropriate delay, writes the data from register 6 to RAM 1.
81 is stopped. Therefore, in this state, the RAMI 81 stores data for an appropriate amount of time before and after the abnormality determination time. Also, when this abnormality is determined, the date and time are read from the clock circuit 187 and stored in the RAM.
I81. Subsequently, the microprocessor 182 drives the dot printer 184 via the printer driver 185 to print waveform data based on the date, time, setting data, etc. stored in the RAM 181 in characters. In this case, the dot printer 184
The paper feeding direction is taken as the time axis, one dot interval is taken as one extended sampling interval, and the data is expanded in the direction perpendicular to the paper feeding direction, each set of maximum value and minimum value is treated as one sample data, and the maximum value and Record the points of the minimum value by connecting them continuously with dots. In this way, the microprocessor 18
The data of each pair of maximum and minimum values read by the dot printer 184 can be expressed as a single straight line, and even though the recorded sample rate obtained by the dot printer 184 is 64 times the power frequency, It is also possible to capture and record pulses with a width as short as 20μ (spike pulses) and peak waveforms of several KHz. Furthermore, the values set by the keyboard 186 and the date and time data of the clock circuit 187 can be displayed on the display device 188 in response to a request from the keyboard 187. Incidentally, an example of a recording waveform by the apparatus of the above embodiment is shown in FIG. Figure 6(a)
is the waveform when the power plug is unplugged, FIG. 6(b) is the startup noise of a refrigerator, room cooler, etc., and FIG. 6(c) is the spike waveform during a lightning strike. As explained in , the high-speed phenomenon automatic recording device of the present invention allows the peak value of a high-speed phenomenon to be superimposed on the waveform of a low-speed phenomenon due to the short recording time and recording length.
It is possible to accurately and easily record and analyze waveforms during abnormalities in power supply systems, etc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a high-speed phenomenon recording device according to an embodiment of the present invention, FIGS. 2m and 3 are waveform diagrams for explaining high-speed phenomena, and FIGS. 4 and 5 are respectively conventional A block diagram showing the configuration of an example of a recording device, FIG.
1A, 2B, and 2C are waveform diagrams showing examples of actual recording waveforms by the high-speed phenomenon automatic recording device of FIG. 1. 13... A/D converter, 14... Maximum value detection circuit,
15... Minimum value detection circuit', 16... Register (temporary storage means), 17... Timing controller (timing control means), 1st... Data processing section, 181
...Memory (RAM), 182...Microprocessor (control device), 184...Dot printer (waveform output means) Patent applicant Kinki Keikiki Co., Ltd. Agent Kama 1) Text 2 Figure 5 Figure 6 figure

Claims (1)

[Scope of Claims] An analog-to-digital (A/D) converter that converts an input signal into a digital signal; and a maximum of sample data within an extended sampling interval that is a predetermined integral multiple of the sampling interval of the A/D converter. a maximum value detection circuit and a minimum value detection circuit for detecting values and minimum values, respectively; storing the outputs of the maximum value detection circuit and minimum value detection circuit until updated by the outputs of these circuits in the next extended sampling interval; Temporary storage means; Timing control means for supplying sampling pulses to the A/D converter and controlling the operation timing of the maximum value detection circuit, the minimum value detection circuit, and the temporary storage means; Each time the register is updated; A memory that stores the contents and is updated from the oldest data from a predetermined period of time each time data is read from the register; a waveform output means that outputs the contents of the memory as a visible waveform; and an output of the register. When a predetermined calculation is performed based on the data and the result deviates from the predetermined steady state condition, the contents of the memory and the output data for an appropriate time thereafter are outputted as the maximum value of each extended sampling interval by the waveform output means. A high-speed phenomenon automatic recording device comprising: a data processing section having a control device that outputs a straight line connecting the minimum values;