JPS6234108B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a power amount display device that displays power amount.

FIG. 1 is a diagram showing the configuration of a conventional device. This device multiplies the load voltage and load current taken out by a voltage transformer and a current transformer installed on the power supply line (not shown) to generate electric power, which is then converted into electric power by a power-to-current converter to generate a current signal proportional to the electric power. After that, the current -
A frequency converter converts it into a pulse frequency signal, divides the frequency appropriately, and supplies it to the first and second counters 1 and 2. Therefore, the counters 1 and 2 count the pulse frequency signals and store them as the total power amount.

The contents of these counters 1 and 2 are displayed by the following operations. That is, the timer device 3
A signal is issued at regular intervals to clear the contents of the register 4 and latch the contents of the second counter 2. Further, the signal of the timer device 3 is transmitted to the delay circuit 5.
The second counter 2 is cleared after a predetermined time delay. Therefore, if the changeover switch 6 is closed to the contact a side, the contents of the first counter 1, that is, the total electric energy, can be displayed on the display section 7, and if the changeover switch 6 is closed to the contact b side, the electric energy at the present time of the current period can be displayed. can be displayed. Further, if the changeover switch 6 is closed to the contact c side, the electric energy for the previous fixed period can be displayed on the display section 7 from the register 4.

Incidentally, the device shown in FIG. 1 uses two counters, but these counters have many problems when integrated into an IC. Therefore, it is desired to achieve the same function by reducing the number of counters as much as possible. Additionally, this device has the disadvantage that it is not possible to directly see the maximum amount of power demand.

The present invention was made in view of the above circumstances, and
In addition to having a configuration suitable for IC conversion, the display of the maximum amount of power demand can increase the utility value for consumers and power suppliers, and can display multiple items of power amount, expanding the range of applications, such as power trends, etc. It is an object of the present invention to provide a power amount display device that allows the user to appropriately understand the power amount.

An embodiment of the apparatus of the present invention will be described below with reference to FIG. In the figure, reference numeral 11 is the same as the counter in FIG. 1 in that it counts a pulse frequency signal proportional to electric power and stores it as the total amount of electric power. 12 is a register 12 based on the contents of the counter 11 by a signal input from a timer device 13 via a delay circuit 14 at regular intervals (for example, one month, etc.).
This is a subtraction circuit that subtracts the contents of and obtains the current amount of electricity. 21 is a register that stores the amount of electricity for the current fixed period, 22 is a register that stores the maximum amount of electricity demanded in the past, and 23 is a register that stores the amount of electricity for the current period and the maximum amount of electricity demanded for the certain period, and calculates the amount of electricity for this period. A comparison circuit 24 outputs a "1" signal when the amount of electricity is large, and a "0" signal when the amount of electricity in the current period is small. ``It is an open/close circuit that opens with a signal. 25 is a display unit that displays the maximum amount of power demand.

Further, 31 is an adder circuit that adds the rewritten contents of the register 21 for each signal output from the timer device 13, and 32 is a register that stores the contents of the adder circuit 31. Note that 31 and 32 may be one register without being separated from each other as long as they have an addition function. Further, the register 21 is connected to the adder circuit 31 and the register 32 from the timer device 13.
The reset signal is input at intervals (for example, one month) that are sufficiently longer than the latch signal that includes the reset. 33 is a delay circuit, 34 is an inverter, 35 is a register, 36 is a changeover switch, and 37 is a display section.

Next, the operation of the apparatus configured as above will be explained. First, the counter 11 counts the pulse frequency signal proportional to the electric power and stores the total amount of electric power, which is then sent to the contact a side of the subsequent changeover switch 36. Further, the register 12 is cleared by a clear signal input from the timer device 13 via the delay circuit 14 at regular intervals, and then the counter 11
The content is read and the total amount of power up to the previous period is stored and supplied to the subtraction circuit 12. The subtraction circuit 15 subtracts the total amount of power up to the previous period in the register 12 from the total amount of power in the counter 11 to obtain the amount of power from the end of the previous period to the present time, and stores it in the register 21. That is, after this register 21 clears its own contents with a clear signal outputted from the timer device 13 at regular intervals, the subtraction circuit 15 subtracts the total electric energy up to the previous period from the total electric energy for the current fixed period. Stores the amount of electricity. Then, using the comparison circuit 23, the electric energy of the current period in the register 21 is compared with the maximum electric energy demand of the register 22, and if the electric energy of the current period is greater than or equal to the maximum electric energy demand, "1" is set. ” signal is output to close the switching circuit 24, and the contents of the register 21 are stored as the maximum amount of power demand up to now. As a result of the comparison in this comparison circuit 23, if the power amount between bases this time is smaller than the maximum demand power amount, a "0" signal is output from the comparison circuit 23, and the switching circuit 24 becomes open and is not updated. The display unit 25 retains the past maximum power demand as it is.
will be displayed on. As a result, the maximum demand power amount can always be displayed on the display unit 25.

In the above device, when the changeover switch 36 is closed to the contact a side, the total amount of electric power can be displayed on the display section 37 since it is connected to the output side of the counter 11. In addition, the changeover switch 36 is set to contact b.
If you close it on the side, you can display the amount of electricity you used for a certain period of time (for example, one month). The reason for this is that if the timer device 13 supplies a signal to the register 21 every fixed period (for example, one day), the register 21 will receive a signal each time.
The rewritten contents of 1 are added and stored in the register 32. Therefore, for example, one month's worth of electric power can be easily stored in the register 32. On the other hand, the timer device 13
If a signal is sent to the register 32 every month from then on, the signal passes through the inverter 34 and enters the register 35 as a latch signal containing clear.
The contents of the register 32 for one month can be transferred to the register 35. Therefore, if the changeover switch 36 is closed to the contact b side, the electric energy for the previous month can be extracted from the register 35 and displayed on the display section 37.

By the way, the monthly signal output from the timer device 13 is delayed by the delay circuit 33 and sent to the register 3.
2, the contents of the register 32 are cleared at this point. Therefore, it is possible to store in the register 32 the amount of power after clearing, that is, the amount of power from the previous month to a certain point in this month. For this reason,
If the changeover switch 36 is closed to the contact c side, the amount of electric power from the previous month to the present moment of this month can be displayed on the display section 37.

As described in detail above, according to the present invention, it is possible to reduce the number of counters and configure the entire device to be optimally integrated into an IC, and it is also possible to directly read the maximum power demand, thereby making it easier for consumers and power suppliers to use the device. can increase value. In addition, it is now possible to display all of the total power amount, previous power amount, current current power amount, maximum demand power amount, etc., which will further expand the scope of use, centralize data processing, and improve power trends. A power amount display device that can obtain data (for example, energy saving measures) can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional device, and FIG. 2 is a block diagram showing an embodiment of a power amount display device according to the present invention. 11...Counter, 12...Register, 13...
...Timer device, 14...Delay circuit, 15...Subtraction circuit, 21, 22...Register, 23...Comparison circuit, 24...Opening/closing circuit, 25...Display section, 31...
...Addition circuit, 32...Register, 33...Delay circuit.

Claims (1)

[Claims] 1. A counter that counts pulse frequency signals proportional to electric power to obtain the total electric energy, and a counter that receives a delayed output signal generated from a timer device every predetermined period and reads the contents of the counter until the end of the previous period. a first storage circuit that stores the total power amount of the counter; a subtraction circuit that subtracts and outputs the power amount of the first storage circuit from the total power amount of the counter; and a subtraction circuit that receives an output signal generated from the timer device. a second storage circuit that stores the electric energy for the current fixed period that has been cleared and output from the subtraction circuit; a third storage circuit that stores the maximum demand electric energy; Compare the power consumption of both memory circuits in No. 3,
Maximum demand power amount display means for closing an opening/closing circuit when the power amount of the second storage circuit is large and storing and displaying the power amount of the second storage circuit in the third storage circuit; a fourth storage circuit that adds and stores the electric energy updated at every predetermined time period in the second storage circuit; means for clearing the fourth storage circuit after storing the amount of power in the fifth storage circuit; and selectively extracting the amount of power from each of the counter, the fourth storage circuit, and the fifth storage circuit. What is claimed is: 1. A power amount display device comprising: means for displaying a power amount;