JPH09196952A - Circuit for detecting pulse train integration frequency value - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detecting circuit for pulse train integration frequency value in a simple configuration wherein both pulse train integration value and pulse frequency value are obtained at the same time and the amount of wiring between equipments can be decreased. SOLUTION: An integration measurement part 51 wherein, with the use of calculation function of a CPU 5, the integrated value of a pulse train is obtained with measurement pulse signal from a pulse generation source 1, and a frequency calculating part 53 wherein, with the input of the calculated value and the reference pulse of a reference oscillation part 52, the pulse frequency is obtained by calculation expression (L-K)/T}, where K is integrated value of the first time of reference pulse, T is time interval, and L is the second time after time interval T, are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulse train integrated frequency value detection circuit for obtaining a measured pulse signal of a pulse oscillator or the like for detecting the rotation speed of an electric motor in an electric motor drive device to detect an integrated value of the pulse train and a pulse frequency. , Is related.

[0002]

2. Description of the Related Art A pulse train integrated frequency value detecting circuit for detecting an integrated value and a pulse frequency of a pulse train from a pulse signal measured by a pulse oscillator or the like is commonly used. FIG. 3 shows a configuration of a main part of a conventional example. 1 is a pulse generator, 2 is a distributor, 3 is an integrating measuring instrument, and 4 is a frequency detector. That is, the integrated value PV of one pulse train and its pulse are measured by the integration measuring instrument 3 and the frequency detector 4 which obtain the measurement pulse inputs PL1 and PL2 via the distributor 2 which obtains the measurement pulse input PL from the pulse generation source 1. The frequency value PF is obtained. Distributor 2 here
Is often installed in order to reliably transmit the pulse train to the integration measuring instrument 3 and the frequency detector 4. As described above, in the conventional technique, the integrated measurement of one pulse train and the detection of the pulse frequency thereof are performed by the independent integrated measuring device and frequency detector.

[0003]

However, in the prior art of this kind, an independent integrating measuring instrument and a frequency detector must be used, and a pulse distributor for that purpose is required. In addition, cables must be connected between these devices, which makes it easy to receive disturbance noise.

An object of the present invention, therefore, is to provide a pulse train integrated frequency value detection circuit having a simple structure capable of simultaneously obtaining a pulse train integrated value and a pulse frequency value.
It is in.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has the following structure. That is, an integrated measurement unit that obtains a measurement pulse signal from a pulse generation source to obtain an integrated value of a pulse train, and an integrated value K of a reference pulse at a first time and a second value after a time interval T with the integrated value and the reference pulse as inputs. And a frequency calculation unit that obtains a pulse frequency from the integrated value L of the time by the calculation formula {(L−K) / T}.

According to such a solution, the measured pulse signal can be input from the pulse generation source to obtain the integrated value of the pulse train, and the integrated value and the reference pulse can be input to obtain the pulse frequency. The configuration can also be simplified.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specifically, an integrated measuring unit that uses the arithmetic function of a CPU, that is, obtains a measured pulse signal from a pulse generation source to obtain an integrated value of a pulse train, and an integrated value of the integrated value and a reference oscillating unit. Frequency calculation to obtain a pulse frequency from the integrated value K at the first time of the reference pulse and the integrated value L at the second time after the time interval T using the reference pulse as an input according to the formula {(L−K) / T} The parts and parts are effectively used. Further, the present invention will be described in detail with reference to the accompanying drawings.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention similar to FIG. 3, and 5 is a CPU. Here, in the CPU 5, 51 is an integrating and measuring unit, 52 is a reference oscillator, and 53 is a frequency calculator. That is, the integration measuring unit 51 counts up or down counts the pulses of the measurement pulse input PL from the pulse generation source 1, and therefore the integration measuring unit 51 can always obtain the integrated value PV of the pulse train. The reference oscillator 52 generates a signal at a predetermined time interval, and the time interval may be constant or may be variable according to the frequency of the measurement pulse input PL. In addition, the frequency calculator 53 uses the reference pulse input PB from the reference oscillator 52 to calculate the integration measuring unit 51.
The integrated value PV obtained by is read and the frequency value PF is calculated. The frequency calculator 53 has a function of storing the integrated value PV.

Further, FIG. 2 shows the waveforms of the respective parts of FIG. 1, that is, the timing positions of the measured pulse input PL waveform and the reference pulse input PB generation. FIG. 2 shows an example in which a timing signal is generated at time T0 and time T1, and the integrated value PV is K at time T0 and the integrated value PV is L at time T1. Here, since the frequency calculator 53 stores K and L of the integrated value PV and the time interval between the time T0 and the time T1 is T, the frequency is calculated by the calculation formula {(L-K) / T}. The value PF is determined. In this example, the integrated measuring unit and the reference oscillator are provided inside the CPU, but they may be provided outside the CPU.

[0010]

As described above in detail, according to the present invention, it is possible to provide a device having a simple structure in which the pulse train integrated value and the pulse frequency value can be obtained at the same time and the wiring between devices can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a waveform diagram showing waveforms at various points in FIG.

FIG. 3 is a block diagram showing a conventional example.

[Explanation of symbols]

 1 pulse generator 2 distributor 3 integrating measuring instrument 4 frequency detector 5 CPU 51 integrating measuring unit 52 reference oscillator 53 frequency calculator PL measurement pulse input PV integrated value PF frequency value PB reference pulse input

Claims (1)

[Claims] 1. A pulse train integrated frequency value detection circuit for detecting a pulse train integrated value and a pulse frequency by obtaining a measured pulse signal from a pulse generation source of a rotating body to be measured, wherein an integrated value of the pulse train is input from the measurement pulse signal input. An integrated measuring section for obtaining, and an integrated value K of the reference pulse at the first time and a second value after the time interval T with the integrated value and the reference pulse as inputs.
A pulse train integrated frequency value detection circuit, comprising: a frequency calculation unit that obtains a pulse frequency from the integrated value L of the time according to the formula {(L−K) / T}.