JPH02312408A - Sampling signal generator - Google Patents

Abstract

PURPOSE:To easily synchronize each sampling by one set of device even in the case plural analog signal input parts exist by generating an internal reference signal from a fundamental oscillation frequency signal, comparing it with an external reference signal, and correcting the fundamental oscillation frequency signal so as to eliminate its phase difference. CONSTITUTION:In the case a reference signal inputted from the outside is 50Hz, a frequency setting part 1 sets an oscillating signal of a fundamental oscillating part so as to become 600Hz in conformity therewith, and an internal reference signal generating part 3 converts this signal of 600Hz to an internal reference signal of 50Hz. In the case a phase of the internal reference signal leads a phase of an external reference signal, a signal for delaying the phase of the internal reference signal is outputted from a phase comparing part 4, and a timing correcting part 5 outputs a correcting signal for delaying the phase of the internal reference signal to the fundamental oscillating part 2. In such a way, since the correction to the fundamental oscillating part 2 is executed, a fundamental oscillation frequency signal synchronizing with the external reference signal is obtained, and in the case plural analog signal input parts exist, each sampling can be synchronized easily.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a sampling signal generation device for generating a sampling signal for determining the timing of inputting an analog signal to a digital relay or the like.

B0 Summary of the Invention The present invention provides a sampling signal generator that uses a commercial frequency signal as an external reference signal and generates a sampling signal for timing the acquisition of an analog signal from the external reference signal. Comparing the phases of the created internal reference signal and the external reference signal, and creating a sampling signal based on the signal corrected to eliminate the phase shift, thereby always outputting a sampling signal synchronized with the external reference signal. In addition, when there are multiple analog signal input sections, it is possible to synchronize the sampling of each with one device.

C0 Conventional technology In general, the timing at which analog signals are taken in in digital relays is based on the commercial frequency signal (60Hz or 50Hz).
It is every 30 degrees or every 90 degrees based on HZ). In this way, a sampling signal for timing the acquisition of analog signals is generated by a sampling signal generator.

D1 Problem to be solved by the invention
There is no problem if you are doing so. However, when there are multiple analog signal capture devices, in order to synchronize the capture timing of each device, each capture device requires a device for creating a sampling signal from a reference commercial frequency signal. Therefore, the device becomes complicated and large.

The present invention has been made in view of the above points, and its purpose is to:
An object of the present invention is to provide a sampling signal generator capable of synchronizing sampling of each analog signal input section with one simple device even when there are a plurality of analog signal input sections.

96 Means for Solving the Problems The present invention provides a sampling signal generation device that uses a commercial frequency signal as an external reference signal and creates a sampling signal for determining the timing of taking in an analog signal from the external reference signal, comprising: the external reference signal. a frequency setting section that sets a basic oscillation frequency according to the frequency of the frequency setting section; a basic oscillation section that creates a basic oscillation frequency signal of the frequency set by the frequency setting section; an internal reference signal generation section that converts the signal into an internal reference signal according to the frequency of the external reference signal; a phase comparison section that compares the output signal of the internal reference signal generation section and the external reference signal to determine a phase shift; and the phase comparison section. a correction unit that corrects the basic oscillation frequency signal of the basic oscillation unit so as to eliminate the phase shift determined by the correction unit; and a sampling signal creation unit that creates a sampling signal based on the output signal of the basic oscillation unit corrected by the correction unit. It is characterized by having a section.

The F4 action frequency setting section sets the frequency of the external reference signal (commercial frequency 50
117 or 60 T-1z), the oscillation frequency of the basic oscillation section is set. The internal reference signal generator generates the output signal of the basic oscillation unit, for example, when the frequency of the external reference signal is 501.
If it is 1z, it is converted to 50I-1z by 4゛.

The 50 Hz Shinko cod converted by this internal reference signal creation section and the external reference signal (501(z) are compared at the 1' position in the comparison section. As a result, the correction section eliminates the phase shift. The basic oscillation frequency signal of the basic oscillation section is compensated as follows.The zumbling signal generation section generates and outputs a zumbling signal with a timing of, for example, every 90 degrees based on the compensated output signal of the basic oscillation section i11. This zumbling signal output is always connected to an external reference signal (e.g. 50 j (
z commercial frequency signal). Therefore, when there are a plurality of analog signal input sections, each zanbling can be easily synchronized by performing zanbling using the output signal of the apparatus of the present invention.

Furthermore, if the external reference signal disappears (due to a commercial power outage, etc.), the zumbling signal output will be ensured, although synchronization will not be achieved. Therefore, processing using the zumbling signal does not stop.

G. Example Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a frequency setting section that sets the oscillation frequency of the basic oscillation section 2 in accordance with a reference signal (commercial frequency signal, 50 Hz or 60 I-IZ) input from the outside. The basic oscillation unit 2 oscillates a basic oscillation frequency signal of 6001-Iz or 720 Hy, for example, according to the settings of the setting unit 1. 3 is based on −7= The output signal of the oscillator 2 is, for example, 6001−(y, to 5
01-1 y, or 72011Z to 60 Ilz
This is an internal reference signal creation unit that converts the internal reference signal into an internal reference signal to create an internal 7<quasi-signal. 4 is a phase comparison unit that compares the internal reference signal (50Hz or 601-(y, ) created by the internal reference signal creation unit 3 with the reference signal (50Hz or 60Hz) input from the outside and determines the phase shift. be.

Reference numeral 5 denotes a timing correction section that corrects the phase of the basic oscillation frequency signal of the basic oscillation section 2 based on the determination result of the phase comparison section 4. Reference numeral 6 denotes a 90° timing generation unit that generates signals every 90° from the output signal of the basic oscillation unit 2. Reference numeral 7 denotes a thumper signal selection section which creates a zumbling signal based on the output signal of the basic oscillation section 2 and the output signal of the 90° timing creation section 6.

In the device configured as described above, if the reference signal (commercial frequency signal) input from the outside is 50 Hz, the frequency setting section 1 sets the oscillation signal frequency of the basic oscillation section 2 to 600 Hz accordingly. Set to . The internal reference signal generation unit 3 converts the signal 5001-Iz into 50
Convert to Hz internal reference signal. The phase of this 50 Hz internal reference signal is determined by the external reference signal (
50I-IZ). If the phase of the internal reference signal is now earlier than the phase of the external reference signal, the phase comparator 4 outputs a signal for delaying the phase of the internal reference signal. For this reason, the timing correction section 5 outputs a correction signal to the basic oscillation section 2 that delays the phase of the internal reference signal. As a result, processing for extending one period j=u period of the basic oscillation signal of the basic oscillation unit 2 is performed. Conversely, if the phase of the internal reference signal is slower than the phase of the external reference signal,
A signal for accelerating the phase of the internal reference signal is output from the phase comparison section 4, and a correction process opposite to that in the above case is performed on the basic oscillation section 2. By correcting the basic oscillation unit 2 in this way, a basic oscillation frequency signal that is always synchronized with the external reference signal can be obtained.

Therefore, the sampling signals created by the 90° timing creation section 6 and the sampling signal selection section 7 are always synchronized with the external reference signal. Therefore, when there are a plurality of analog signal input sections, there is no need to provide a plurality of sampling circuits, and each sampling can be easily synchronized by simply using the output signal of the circuit shown in FIG.

Furthermore, if the external reference signal is lost due to a power outage of the commercial power supply, etc., the synchronization will become asynchronous, but the sampling signal output itself will be ensured, so various processes using the sampling signal will not be stopped.

The frequency of the basic oscillation signal of the basic oscillation unit 2 is 600Hz.
, 720Hz, and other frequencies may be used.

I] Effects of the Invention As described above, according to the present invention, an internal reference signal is created from a fundamental oscillation frequency signal, this signal is compared with an external reference signal, and the fundamental oscillation frequency signal is adjusted to eliminate the phase difference. is corrected and a sampling signal is obtained based on the corrected signal, and the following effects can be obtained.

(1) Even if there are multiple analog signal input sections, there is no need to provide multiple sampling circuits, and each sampling can be easily synchronized using only one I11 device.

(2) If the external reference signal is lost, it will become unsynchronized, but
Since the sampling signal is secured, processing using that signal does not have to be stopped.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1. Frequency setting section, 2. Basic oscillation section, 3. Internal reference signal generation section, 4. Phase comparison section, 5. Timing correction section, 6. 90° timing generation section, 7. - Sampling signal selection section. 2 people outside

Claims (1)

[Claims] (1) In a sampling signal generation device that uses a commercial frequency signal as an external reference signal and creates a sampling signal for determining the timing of capturing an analog signal from the external reference signal, the basic oscillation frequency is set according to the frequency of the external reference signal. a frequency setting section for setting a frequency, a basic oscillation section for creating a basic oscillation frequency signal of the frequency set by the frequency setting section, and an output signal of the basic oscillation section for converting the output signal of the basic oscillation section into an internal reference signal according to the frequency of the external reference signal. an internal reference signal generation section for converting; a phase comparison section for comparing the output signal of the internal reference signal generation section and the external reference signal to determine a phase shift; and a phase comparison section for eliminating the phase shift determined by the phase comparison section. further comprising: a correction section that corrects the fundamental oscillation frequency signal of the basic oscillation section; and a sampling signal creation section that creates a sampling signal based on the output signal of the basic oscillation section corrected by the correction section. sampling signal generator.