JPH0648425Y2 - Prepaid electricity meter - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a prepaid electricity meter used in a villa or the like.

In particular, prepayment method using magnetic cards (prepaid method)
It is related to electricity meters.

[Prior Art] A configuration of a conventional example will be described. A conventional prepayment type watt-hour meter was connected to a power meter connected to a power source, a load switch whose input side was connected to the power meter circuit and whose output side was connected to a load, and to this load switch. It is composed of a load control circuit, a magnetic card reader / writer, a power processing circuit, a load control circuit and a central processing circuit connected to the magnetic card reader / writer.

Next, the operation of the above-mentioned conventional example will be described.

First, the central processing circuit causes the magnetic card reader / writer to draw the magnetic card inside and read the amount data.

The central processing circuit determines whether there is a remaining amount of money based on the read amount of money data, and if there is a remaining amount of money, supplies electricity to settle the remaining amount of money. That is, the supply of electricity is controlled by the load control circuit to close the load switch.

Normally, continue supplying electricity until the remaining amount runs out,
When the balance is exhausted, eject the magnetic card to the outside. Then, the electricity is cut off. That is, the load control circuit controls the opening of the load switch.

[Problems to be Solved by the Invention] In the conventional prepayment type watt-hour meter as described above, after issuing a request to eject the magnetic card, the electricity is cut off regardless of whether the ejection is successful or not. However, if the ejection fails and the magnetic card still remains inside, there is a problem in that it is inconvenient to take emergency measures.

This invention has been made to solve the above-mentioned problems, and it is possible to continue supplying electricity even if discharge of the recording medium fails, which is convenient for taking emergency measures. Aim to get.

[Means for Solving the Problems] The prepaid power meter according to the present invention comprises the following means.

(I). A recording medium reader / writer that draws a recording medium into the inside to read the amount data, rewrites the amount data of the recording medium and discharges it to the outside, and detects the success or failure of discharging the recording medium.

(Ii). A load control circuit that controls the opening and closing of a load switch connected between a power source and a load.

(Iii). After issuing a request to eject the recording medium to the recording medium reader / writer, if the ejection is successful, if successful, issue a request to open the load switch to the load control circuit after a lapse of a predetermined time, and fail. A central processing circuit that keeps the electricity supplied when you do.

[Operation] In the present invention, the recording medium reader / writer pulls the recording medium into the inside to read the amount data, rewrites the amount data of the recording medium, and discharges the recording medium to the outside. The success or failure of is detected.

Further, the load control circuit controls opening / closing of the load switch connected between the power supply and the load.

The central processing circuit causes the recording medium reader /
After the ejection request of the recording medium is issued to the writer, if the ejection success or failure is judged and succeeds, an opening control request of the load switch is issued to the load control circuit after a lapse of a predetermined time.
In case of failure, the electricity supply is continued.

[Embodiment] The configuration of the embodiment will be described with reference to FIG.

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

Referring to FIG. 1, an embodiment of the present invention includes an electric energy metering circuit (1) connected to a power source (not shown), and an input side connected to the electric energy metering circuit (1) and an output side connected to a load (not shown). Load switch (2), power supply circuit (3) connected to the power supply, magnetic card (4), magnetic card reader / writer (5) for handling this magnetic card (4), and electric energy metering A central processing circuit (6) such as a microcomputer connected to the circuit (1) and a magnetic card reader / writer (5), and a load switch (2) whose input side is connected to this central processing circuit (6) and whose output side is And a display circuit (8) connected to the central processing circuit (6).

Next, the operation of the above-described embodiment will be described with reference to FIG.

FIG. 2 is a flow chart showing the operation of one embodiment of the present invention.

In step (10), the central processing circuit (6) causes the magnetic card reader / writer (5) to move the magnetic card (4).
Is drawn inside and the amount data is read. This amount data is stored in the memory inside the central processing circuit (6).

Central processing circuit (6) in steps (11) to (13)
Determines whether there is a remaining amount of money based on the read amount data, and if there is a remaining amount of electricity, supplies electricity to settle the remaining amount of money. That is, for the supply of electricity, the load control circuit (7) controls the load switch (2) to be closed. For clearing the remaining amount of money, for example, one pulse counts the pulses from the electric energy measuring circuit (1) corresponding to the used electric energy of 1 Kwh, and the used electric energy is obtained. Then, the electricity amount charge obtained by multiplying the electricity amount unit price (unit price per unit amount of electricity) by the amount of used electricity is subtracted from the remaining amount. Normally, the series of processes described above is performed at regular time intervals (sampling intervals) until the remaining amount of money runs out.

In step (14), when the balance is exhausted, the magnetic card (4) is discharged to the outside. That is, the central processing circuit (6) issues a request for ejecting the magnetic card (4) to the magnetic card reader / writer (5). The magnetic card reader / writer (5) drives the magnetic card (4) to the ejection port by an internal drive mechanism. Further, the magnetic card reader / writer (5) detects whether or not the magnetic card (4) has been completely ejected to the outside by an internal sensor.

Central processing circuit (6) in steps (15) to (16)
Judges whether or not the magnetic card (4) has been ejected normally based on the detection result of the sensor of the magnetic card reader / writer (5). If not, continue supplying electricity as it is. In other words, the electric power is cut off by the load control circuit (7).
The load switch (2) is controlled to open after a lapse of a predetermined time.

In either case, electricity is not immediately interrupted immediately after the magnetic card (4) is ejected, which is convenient for the user. In particular, if ejection fails, it is possible to take out the magnetic card (4) manually or call a service engineer.

The embodiment of the present invention does not shut off electricity even if the magnetic card (4) is unsuccessfully ejected, which is convenient for the user and also records the amount of electric power used. Furthermore, even if the discharge is successful, the electricity is not cut off immediately, so it can be replaced with a new magnetic card under bright lighting.

By the way, in the above description, the case of the magnetic card type watthour meter was described, but it goes without saying that other recording media such as an optical card type and an IC card type can also be used.

[Advantages of the Invention] As described above, the present invention draws the recording medium into the inside to read the amount data, rewrites the amount data of the recording medium and ejects it to the outside, and detects the success or failure of the ejection of the recording medium. A recording medium reader / writer, a load control circuit for controlling opening / closing of a load switch connected between a power source and a load, and a discharge request for the recording medium to the recording medium reader / writer. If it succeeds by judging success or failure and issues a request to open the load switch to the load control circuit after a lapse of a predetermined time, and if it fails, it has a central processing circuit for continuing the supply of electricity. Even if the ejection of the medium fails, the electricity can be continuously supplied, which is convenient for taking emergency measures.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flow chart showing an operation of the embodiment of the present invention. In the figure, (1) ... electric power metering circuit, (2) ... load switch, (3) ... power supply circuit, (4) ... magnetic card, (5) ... magnetic card reader / writer, ( 6) ... Central processing circuit, (7) ... Load control circuit, (8) ... Display circuit. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A recording medium reader / writer, a power source, and a power source which detect the success or failure of ejection of a recording medium by reading the amount data of the recording medium, rewriting the amount data of the recording medium, and ejecting the amount to the outside. A load control circuit for controlling the opening and closing of the load switch connected between the loads, and after issuing a request for ejecting the recording medium to the recording medium reader / writer, determining the success or failure of the ejection and determining if the ejection is successful. A prepayment type watt hour meter, comprising a central processing circuit for issuing an open control request for the load switch to the load control circuit after a lapse of time and continuing the supply of electricity in the case of failure.