JPH0427875A - Prepayment type watthour meter - Google Patents

Abstract

PURPOSE:To eliminate the subtraction error of a basic charge by comparing the sum total of the subtracted basic charge in the month with a month basic charge to be subtracted when a gauge examination day is discriminated to perform exact calculation. CONSTITUTION:At the time of gauge examination, a central processing unit 1A containing an exact calculation means adds subtracting charges from day to day. Herein, the subtracting charge of the previous time is zero in an initial value. It is discriminated whether the present date read from a clock apparatus 6 is a gauge examination day and, in the case of the gauge examination day, the difference of the sum of a read month basic charge and a calculated month subtracting charge is calculated and subtracted from or added to the balance. That is, exact calculation is carried out so that the subtraction of the basic charge of the month becomes equal to the month basic charge. The sum of the subtracting charges is made zero to prepare for the operation of the next month.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a prepaid watt-hour meter used in villas, etc., and particularly relates to a prepaid watt-hour meter using a magnetic card or the like. It is.

[Conventional technology]

FIG. 3 is a block diagram showing a conventional prepaid power I meter, in which C1 (1) is a central processing unit, (2) is a magnetic card reader/writer connected to this central processing unit (1), (3) is a magnetic card inserted into and ejected from this magnetic card reader/writer (2), (4) is a central processing unit (1)
Switches (4), (5) such as relays connected to the power source of the lead-in power line and the central processing unit (1) are connected between the switch (4) and the load (8). (6) is a clock device (6) connected to the central processing unit (1), (7) is a clock device (6) connected to the central processing unit (1).
), which is a display device (7) 9.Next, the operation will be explained with reference to FIGS. 3 and 4.

In Figure 3, the central processing unit! (1) waits until the magnetic card (3) is inserted into the insertion slot of the magnetic card reader/writer (2). When the magnetic card (3) is inserted, the magnetic card reader/writer (2) reads the magnetic card (
Amount data is read from 3), and the central processing unit (1) stores it as a balance.

Further, the amount data is displayed on the display device (7>).

The central processing unit (1) controls the switch (4) to close and supplies power to the load (8). Here, it is determined whether or not it is possible to withdraw the 1 kWh charge in advance, and if it is not possible, the switch (4) is opened to shut off the power, and the magnetic card reader/writer (2) is used to remove the magnetic card (3 kWh). ) to the remaining amount, and then eject the magnetic card (3) from the ejection port of the magnetic card reader/writer [2].

If it is possible to withdraw 1 kwh, 1 kw from the remaining balance
Charges for h are deducted and the balance is updated and displayed on the display device (7). The electric power pulse sent from the electric power detection device (5) is measured, and when 1 kwh is consumed, a new charge for 1 kwh is deducted. In other words, every time 1 kWh is consumed, the charge for 1 kWh is deducted in advance.

The clock device (6) changes daily (for example, 23:05 on October 1st).
9 minutes to October 2nd 00:00), the daily basic charge is calculated and deducted from the predetermined monthly basic charge. In FIG. 4, in step (21), it is determined whether the daily change occurs, and if it is not a daily change, the process ends without deducting the basic charge.

If it changes daily, proceed to step (22), read out the predetermined monthly basic charge A, and step (23)
), the number of calendar days B in the current month is calculated from the current month read from the clock device (6), and in step (24),
The monthly basic charge A is divided by the number of calendar days B in the current month to calculate the daily basic charge C.

In step (25), step (24)
) is deducted from the daily basic charge C, and the balance is updated and displayed on the display device (7).

If withdrawal is not possible, open the switch (4) to cut off the power, use the magnetic card reader/writer (2) to rewrite the contents of the magnetic card (3) to balance - zero, and remove the magnetic card. Remove the magnetic card (3) from the ejection port of the card reader/writer (2).
discharge.

[Problem to be solved by the invention]

Since conventional prepaid electricity meters are configured as described above, there is a problem in that the calculation of the basic charge per unit may have a floating decimal point part, causing an error and causing an error in the withdrawal amount. Ta.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a prepaid watt-hour meter that can eliminate errors in the deduction of basic charges.

[Means to solve the problem]

The prepaid electricity meter according to the present invention is provided with a meter reading settlement processing means that compares the sum of the basic charges deducted in the month with the monthly basic charges to be deducted and performs settlement when it is determined that it is a meter reading date. It is something that

[For production]

In this invention, in the settlement on the day of meter reading, if the amount withdrawn is large, the difference will be refunded, and on the other hand, if the amount withdrawn is small, an additional charge will be made.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing an embodiment of the present invention.
2) to (7) are completely the same as the conventional device described above.

This embodiment differs from the conventional device in that the central processing unit (1^) including the meter reading settlement processing means according to the present invention is used instead of the conventional central processing unit (1).

Next, operation 3 of the above-described embodiment will be explained with reference to FIG. 2. The operations except for the withdrawal of the basic charge are exactly the same as those of the conventional example.

In FIG. 2, steps <11) to (15)
is the same as the processing of steps (21) to (25) in the conventional example described above. In step (16), the withdrawal amount is added to the previous withdrawal amount. That is, the withdrawal amount is added and stored every day. However, the initial value of the previous withdrawal amount is zero. In step (17), it is determined whether the current date read from the clock device (6) is the meter reading date or not, and if it is not the meter reading date, the operation of igniting the basic charge is terminated.

If it is a meter reading day, proceed to step (18) and step (
Monthly basic charge A read in step 12) and step (16)
Find the difference between the total monthly withdrawal amounts calculated in , and subtract or add it to the balance. In other words, settlement is made so that the basic charge for the corresponding month is equal to the monthly basic charge A. In step <19), the sum of the withdrawal amounts is set to zero to prepare for the calculation for the next month.

〔Effect of the invention〕

As described above, according to the present invention, since the meter reading settlement processing means is provided to perform settlement processing of the basic charge on the day of meter reading and to additionally collect or refund the basic charge as necessary, the basic charge can be withdrawn. This has the effect of completely reducing the error to zero.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
Fig. 3 is a flowchart showing the operation of igniting the basic charge according to an embodiment of the present invention, Fig. 3 is a block diagram showing a conventional prepaid watt-hour meter, and Fig. 4 shows the basic charge of the conventional prepaid watt-hour meter. It is a flowchart which shows the operation|movement of ignition. In the figure, (1^) is the central processing unit, (2) is the magnetic card reader/writer, (3) is the magnetic card, (4) is the switch, (5) is the electric energy detection device, and (6) is the clock device. , (7
) is a display device, and (8) is a load. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] A recording medium reader/writer that reads and rewrites monetary data recorded on a recording medium, deducts a basic charge for each predetermined unit, and further performs settlement processing of the basic charge on the day of meter reading. A prepaid electricity meter characterized by comprising: a settlement processing means at the time of meter reading for additionally collecting or refunding basic charges as necessary;