JPS5818605B2 - Maximum value weighing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a maximum value measuring device that displays the maximum count value of input pulses.

Conventionally, there is a device that measures the consumption of electricity, gas, etc., converts it into pulses for each unit of consumption, and, for example, counts and displays the pulses in a remote location. There is a maximum value measuring device that counts and displays the maximum value of the counted value.

By the way, such a measuring device has a maximum value addition counter and a subtraction counter, and after setting the contents of the maximum value addition counter to a subtraction counter at regular intervals to equalize the counted contents of both, input pulses are supplied to the subtraction counter. When the content of the subtraction counter becomes zero, the zero signal is used to block the supply of input pulses to the subtraction counter and supply the input pulse to the maximum value addition counter, so that the input pulse is always The maximum counted value is held by a maximum value addition counter, and the measured contents of the counter are displayed on a display.

However, in order to display the maximum value of the integrated count value, the above-mentioned device requires a subtraction counter in addition to the maximum value addition counter, but has the disadvantage that the count display can only display the maximum value.

The present invention has been made in order to improve the above-mentioned disadvantages, and it clears the contents of a counter that counts input pulses at certain time intervals after latching them, and compares the latched contents with the next count value of the counter. A maximum value measuring device that not only displays the maximum value but also displays the count contents of the counter after clearing, making it possible to display not only the maximum value but also the cumulative count value for each time period with a small number of counters. It provides:

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the figure, 11 is a terminal to which input pulses are applied, and a counter 12 for integrating and counting input pulses is connected to this terminal.

Reference numeral 13 denotes a terminal to which a timed pulse is applied at regular intervals, and a flip-flop circuit 14 is connected to this terminal.

Note that this timed pulse resets the flip-flop circuit 14 and prevents the subsequent latch circuit 15 from storing the contents of the counter 12.

Reference numeral 15 denotes a latch circuit that latches or reads the contents of the counter 12 using the output signal 1 from the flip-flop circuit 14, and the contents of this latch circuit 15 are displayed on a maximum value display device 16 that displays the maximum value. Ru.

Reference numeral 17 denotes an integrated count display device for each time period that displays the contents of the counter 12 for each time period.

18 is a coincidence circuit that compares the contents of the counter 12 and the contents of the latch circuit 15 and outputs a coincidence signal when the contents of the counter 12 become larger than the contents of the latch circuit 15;
The flip-flop circuit 14 is set by this coincidence signal, and a read command is given to the latch circuit 15.

As a result, the latch circuit 15 reads the contents of the counter 12.

19 is a terminal to which a clear signal is applied.

Next, the operation of the maximum value measuring device shown in the figure will be explained.

The input pulses sequentially applied to the terminal 11 are integrated and counted by the counter 12 .

When a timed pulse is applied to terminal 13 in this state, flip-flop circuit 14 is reset, thereby causing latch circuit 16 to latch the contents of counter 12.

Further, the contents of the counter 12 are made zero by a clear pulse generated after a sufficient time has elapsed for the contents of the counter 12 to be completely latched into the latch circuit 15 after inputting the timed pulse.

At this time, the contents of the latch circuit 15 do not become zero.

Thereafter, the counter 12 integrates and counts the input pulses until a timed pulse arrives, and these circuits 12.15
The contents of are displayed on the display device 17.16.

(2) Now, the case where the cumulative count value of the counter 12 up to the next time period is smaller than the content of the latch circuit 15 will be explained.

In this case, since the contents of the counter 12 are smaller than the contents of the latch circuit 15, the coincidence circuit 18 does not output a coincidence signal.

Therefore, the output state of the flip-flop circuit 14 does not change, and the latch circuit 15 maintains the latched state.

In this state, the counter 12 counts the input pulses each time they arrive at the terminal 11, and
The cumulative count value is displayed on the time period cumulative count display device 17.

On the other hand, the maximum value display device 16 displays the contents of the latch circuit 15, that is, the maximum value.

Then, after a certain period of time has elapsed, a timed pulse is input to the terminal 13, but as long as the content of the counter 12 is smaller than the content of the latch circuit 15, the output terminal of the flip-flop circuit 14 has no output signal! Since the state is 1011, no signal is output from the circuit 14.

Therefore, the latch circuit 15 continues in the latched state.

On the other hand, the counter 12 is cleared by a clear signal input after a predetermined period of time has elapsed after the input of the time pulse, and the display device 17 is also cleared to zero accordingly.

◎.Furthermore, a case will be described in which the cumulative count value of the counter 12 up to the next time period becomes larger than the content of the latch circuit 15.

When the counter 12 integrates the input pulses and the integrated count value matches the contents of the latch circuit 15, a match signal is output from the match circuit 18 and the flip-flop circuit 14 is set.

Then, the latch circuit 15 stops the latch operation by the output signal of the flip-flop circuit 14, and the counter 12
Read the contents of.

Furthermore, when input pulses arrive one after another, the counter 12
is integrated and counted as is, and the latch circuit 15 also changes according to changes in the integrated content.

Therefore, the display devices 16 and 17 change according to the values of the latch circuit 15 and the counter 12.

At this time, since the latch circuit 15 corresponds to the contents of the counter 12 in a one-to-one relationship, each display device 16
．． 17 will display the same content.

When a timed pulse arrives in such a state, the flip-flop circuit 14 is reset as described above, and the latch circuit 15 performs a latch operation.

Therefore, the contents of the latch circuit 15 have launched the maximum value within each time period, and the display device 16 displays the maximum value.

Thereafter, the contents of the counter 12 are cleared to zero by the clear pulse, and the display device 17 displays zero.

Thereafter, the counter 12 continues to integrate and count the input pulses that arrive one after another.

For example, when such an operation is applied to a maximum demand electricity meter, the display on the display device 16 corresponds to the black mark (maximum value indication) on the electricity meter, and the display on the display device 17 corresponds to the infrared (indication of the maximum value) on the electricity meter. (return every time period).

Note that the display device 17 is not necessary when only the maximum value is displayed, but it is effective when comparing the maximum value and the integrated value within a time limit.

As detailed above, according to the present invention, the integrated count value of input pulses is captured by a counter, this is latched by a latch circuit at fixed time intervals, and the contents of these counters and latch circuits are displayed on a display device. With this configuration, the maximum value within a predetermined time period can be digitally displayed with a simple configuration.

In addition, it is now possible to display both the maximum value and the pulse integrated count value for each time period at the same time, so the contents of the latch circuit can be easily recorded on a recording device, and the maximum value for each time period can also be displayed. It also has various effects, such as being able to check the load status within a certain period of time by printing it out.

[Brief explanation of drawings]

The figure is a block diagram illustrating an embodiment of the maximum value measuring device according to the present invention. 12...Counter, 14...Flip-flop circuit, 15...Latch circuit, 15.
17... Display device, 18... Matching circuit.

Claims (1)

[Claims] 1. A counter that cumulatively counts human power pulses, a latch circuit that latches the contents of this counter for each timed pulse,
a matching circuit that compares the contents of the counter and the latch circuit and outputs a match signal when the contents of the counter becomes larger than the contents of the latch circuit to cause the latch circuit to read the contents of the counter; and the latch circuit. a maximum value display device that displays the maximum value from the output of the counter, a time period cumulative count display device that displays the time period cumulative count value using the output of the counter supplied to the - number circuit, and an input of the time pulse. A maximum value measuring device comprising means for clearing the counter with a clear signal input later.