JPS6029685Y2 - totalizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an integrator that converts an input signal voltage into a pulse signal and operates a counter using the pulse signal to obtain an integrated value of the input signal voltage.

This type of integrator requires a voltage frequency converter to convert the input signal voltage into a pulse signal with a frequency proportional to its magnitude, but generally in industrial measurement, the input signal voltage is DC 1 to 5 V. Since the signal has a base component, first, the unnecessary base component (1v) is erased, leaving only the signal component (0 to 4v), and then voltage-frequency conversion is performed.

Therefore, in order to adjust the output pulse signal, it is necessary to adjust the frequency (or the number of pulses) to zero, which has the disadvantage that the adjustment is difficult and takes a long time.

In the present invention, an input signal voltage having a base component is directly converted into a voltage frequency, and then subtraction with the frequency corresponding to the base component is performed using a frequency subtracter consisting of two JK flip-flops. This is an integrator with a simple configuration that can effectively eliminate defects.

FIG. 1 is a connection diagram showing one embodiment of the inventive integrator.

In the figure, 1 is an input terminal to which an input signal voltage Ei such as DC 1 to 5V is applied.

2.3 are voltage frequency converters, respectively, voltage frequency converter 2
The voltage frequency converter 3 inputs the input signal voltage Ei and outputs a pulse signal Pi with a frequency fi proportional to the magnitude of Ei, and the voltage frequency converter 3 inputs a set voltage Es corresponding to the base of Ei, The frequency f is proportional to the magnitude of
It outputs a setting pulse signal Ps of s.

4 is a frequency subtracter, two JK flip-flops FF
1. Consists of FF2.

FF1. The output pulse Pi of the voltage frequency converter 2 is commonly applied to the clock terminal CP of the FF2.

Further, a setting pulse Ps from the voltage frequency converter 3 is applied to the clear terminal CL of the FF2.

In addition, the J terminal of FF2 is kept at the "Htt level", the K terminal is kept at the "L" level, and the Pi applied to the terminal -CP
At the rising edge of , the output terminal Q becomes ``H'' level.

The J terminal of FF1 and the terminal are commonly connected to the output terminal Q of FF2, and the output Pa of FF2 is applied.

Therefore, in FF1, if Pa is at the "H" level, the output Po is inverted at the rising edge of Pi applied to the clock terminal CP, and if Pa is at the "LSI level", the output Po is not inverted and maintains the previous state.

5 is a counter, which is operated by the output pulse Po of the frequency subtracter 4;

The operation of the inventive integrator constructed in this manner will be described below.

First, in the frequency subtracter, as shown in the waveform diagram of FIG. 2, when the output pulse Ps of the voltage frequency converter 3 is applied to the clear terminal CL of the FF2, the FF2 is cleared and its output Pa is at the L99LSI level.

Next, the output pulse Pi from the voltage frequency converter 2 is applied to FF1.
．． When applied to the clock terminal CP of FF2, the output PO of FF1 is not inverted since the inputs to the J terminal and the terminal of FF1 are both at "L" level.

On the other hand, in FF2, the output Pa becomes H" level at the rising edge of Pi.

Therefore, one pulse of the output pulse Pi from the voltage frequency converter 2 is ignored.

If the output pulse Pi is continuously applied from the voltage frequency converter 2, the output Pa of FF2 is at the 'Htt level, and the output pulse Pi of FF1 is
Since the J terminal and the terminal of the F are both “Hot level”,
The output Po of F□ is inverted.

At this time, the output Pa of FF2 does not change. When the setting pulse Ps from the voltage frequency converter 3 is applied in this way, one pulse of the output pulse Pi of the voltage frequency converter 2 is ignored, and the frequency fo of the output pulse signal Po is
is proportional to the frequency fi of the pulse Pi minus the frequency fs of the setting pulse Ps.

The characteristic curve in Figure 3 shows this relationship, where fi=fa
When fo=Q, and 01fi (f even in fs).

=0.

Since fi is proportional to the input signal voltage Ei and fS is proportional to the voltage Es corresponding to the base of Ei, the frequency f of the output pulse signal Po.

is proportional to the signal component (0 to 4 V) of the input signal type IEEEi.

Since the counter 5 is operated by this output pulse signal Po, the counter 5 can integrate only the signal of the input signal voltage Ei.

Note that in the above example, a voltage frequency converter is used as a means for generating a pulse output with a frequency fs proportional to the voltage corresponding to the base component of the input signal voltage Ei, but in normal industrial measurement, the signal component of Ei is Since it is 1v,
It may also be generated using an oscillator.

Further, when the pulse width of the setting pulse Ps is large, it is sufficient to reduce the pulse width of PS through a one-shot circuit or the like and then apply it to the clear terminal CL of the FF2.

As explained above, in the present invention, the input signal voltage having a base component is directly converted into a pulse signal by a voltage frequency converter, and then subtraction with a pulse signal having a frequency corresponding to the base component is performed using two JK flip-flops. Since this is carried out using a frequency subtracter consisting of a frequency subtracter, an integrator with easy zero adjustment can be obtained with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a connection diagram showing one embodiment of the inventive integrator, and FIGS. 2 and 3 are diagrams illustrating its operation. 2.3...Voltage frequency converter, 4...
Frequency subtractor, 5...Counter, FF□, FF
2...JK flip-flop, Ei...
・Input signal voltage, Es...Setting voltage.

Claims (1)

[Scope of utility model registration request] a voltage frequency converter that converts an input signal voltage into a pulse signal with a frequency corresponding to the magnitude thereof; a circuit that generates a setting pulse with a frequency corresponding to a voltage corresponding to the base portion of the input signal voltage; a second JK flip-flop, the pulse signal from the voltage frequency converter is commonly applied to the CP terminals of both flip-flops, and the setting pulse signal is applied to the CL terminal of the second JK flip-flop;
and the output of the second JK flip-flop is commonly applied to the J terminal of the first JK flip-flop,
a frequency subtracter that obtains a pulse signal with a frequency corresponding to the difference in frequency between the two pulse signals at the output of the JK flip-flop; and a frequency subtracter that operates by the output pulse signal from this frequency subtracter and integrates the signal portion of the input signal voltage. an integrator comprising a counter for