JPS6014307B2 - electricity bill meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power meter that displays the charge for the amount of power used.

Conventionally, general consumers have been able to know the amount of power they have used using a power meter, but in order to know how much it will cost, they have had to do some detailed calculations.

That is, the fee is based on the unit price that varies depending on the amount of power used and the basic fee, but is the sum of the amount-of-use fee. If you can know at a glance the charges for the amount of electricity you use, you will be able to use electricity more effectively and save more money. An object of the present invention is to provide a power meter that displays the charge for the amount of power used. Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows one embodiment. The contactless current detector 1 electromagnetically detects a load current flowing through a power line without contact, and detects the load current from a power line or the like connected to a current limiter. The plug 2 is inserted into an outlet provided on a power line and takes out the load voltage. The current output of the non-contact current detector 1 and the voltage of the plug 2 are input to the power-to-frequency conversion circuit 3, where they are first proportionally reduced to a current and voltage suitable for semiconductor components, and then multiplied to produce a current or voltage proportional to the power. and then into pulses with a frequency proportional to the power. This pulse is divided by a frequency dividing circuit 4 at a rate of one pulse per unit electric energy, and is counted by a power weight counting circuit 5. That is, the count value of the power amount counting circuit 5 indicates the power amount. The voltage of the plug 2 is applied to a power supply circuit 8 via a surge absorbing element 6 and a power transformer 7, and the power supply circuit 8 supplies DC power supply voltage to each circuit. The basic charge/unit price setting section 9 has four numerical value setters DS, DS2, D.
Consisting of S3 and DS4, the numerical value setter DS displays the basic charge, the numerical value setter DS2 displays the unit price per unit electric energy for up to 12 dishes WH, and the numerical value setter DS3 displays, for example, the 12
The unit price for 1KWH or more and 20 skins WH or less is determined by the numerical setting device DS.
For example, a unit price of 201KWH or more is set in 4.The boundary value setting section 10 includes two numerical value setting devices DS5.
, DS6, and these numerical value setters DS5 and DS6 have boundary values of electric energy at which the unit price changes, for example, 12 foxes WH and 2 foxes WH.
0 plate WH and 0 plate WH are respectively set. When the reset switch 11 is closed for a short time at the start of electricity rate measurement,
The single pulse generation circuit 12 generates a single pulse reset signal, and resets the frequency dividing circuit 4, the electric energy counting circuit 5, the charge counting circuit 13, the boundary value selection circuit 14, and the basic charge/unit price selection circuit 15. do.

As a result, the boundary value selection circuit 14 selects the numerical value setter DS5 and sets the set value 120 (KWH) to the second comparison circuit 16.
Output to. Further, the basic charge/unit price selection circuit 15 outputs the value of the basic charge set in the numerical value setter DS to the first comparison circuit 17. At the same time, the reset signal is applied to the OR gate 0. input to the R-S flip-flop FF, and set it to the AND gate G.
Open 2 t Also, the reset signal is input to the R-S flip-flop FF2 of the second gate circuit 19, sets it, and opens the AND gate G3. When the AND gate G2 is opened, the high frequency pulses outputted from the oscillation circuit 20 are sent to the charge counting circuit 13 and the basic charge/unit price counting circuit 21, where they are counted.

When the basic charge/unit price counting circuit 21 counts the number of high-frequency pulses equal to the value of the basic charge, the first comparator circuit 17 sends its output to the R-S flip-flop FF, resets it, and sets the AND gate G2. When closed, the input of high frequency pulses to the charge counting circuit 13 and the basic charge/unit price counting circuit 21 is cut off. Therefore, the count value of the charge counting circuit 13 becomes the value of the basic charge, and the display circuit 22 displays the basic charge. At the same time, the basic charge/unit price counting circuit 21 is reset by the output of the first comparison circuit 17. The output of the first comparator circuit 17 passes through an AND gate Q and an OR gate G4 and is input as a selection control signal to the clock terminal CL of the basic charge/unit price selection circuit 15 to select the numerical value setter DS2. As a result, the unit prices for up to 12 skins WH set in the value setter DS2 are output to the first comparison circuit 17. The output of the first comparison circuit 17 is output from the delay circuit 23.
The input signal is delayed by FF2 and input to the reset input terminal R of the RS flip-flop FF2, resetting it and closing the AND gate G3. When a unit power amount (for example, IKWH) is consumed and the frequency dividing circuit 4 outputs one pulse, this pulse is counted by the power amount counting circuit 5, and is also sent to the R-S flip-flop FF via the OR gate G. input to the set input terminal S, set it, and open the AND gate G2.The high frequency pulse of the oscillation circuit 20 is input to the charge counting circuit 13 and the basic charge/unit price counting circuit 21;
The unit price is counted up to the unit price set by the numerical value setter DS2. When the counted value of the basic charge/unit price counting circuit 21 becomes equal to the set value of the value setter DS2, the first comparison circuit 17
gives output. This output resets the R-S flip-flop FF and closes the AND gate G2.
The basic charge/unit price counting circuit 21 is reset. The charge counting circuit 13 adds the IKWH charge to the basic charge, and the display circuit 22 displays the counted value as the power charge. The output of the first comparison circuit 17 passes through the delay circuit 23 and is connected to the reset input terminal R of the R-S flip-flop FF2.
, but the R-S flippf. Since the FF2 is in the reset state, the output does not change. In this way, each time the frequency dividing circuit 4 outputs one pulse, the charge counting circuit 1
3 adds and counts a number of high-frequency pulses equal to the unit price value,
The display circuit 22 displays the basic fee plus military fee. When the count value of the power consumption counting circuit 5 becomes equal to the boundary value (12 plates WH) set by the numerical value setting device DS5, the second comparison circuit 16 sends a selection control signal to the boundary value selection circuit 14 via the delay circuit 24. At the same time, a selection control signal is sent through the OR gate G4 to the basic charge/unit price selection circuit 15 to select the numerical value setter DS3.

Between 121 and 200 KWH, each time the frequency dividing circuit 4 outputs one pulse, the charge counting circuit 13 changes the value setting device DS3.
The display circuit 22 adds and counts the number of high-frequency pulses equal to the unit price value set by , and displays the metered charge from the basic charge plus the metered charge for 1 to 12 dishes WH plus 121 KWH to the current power consumption.

Similarly, when the amount of electricity reaches 200KWH, the second comparison circuit 16 sends a selection control signal to the basic rate/unit price selection circuit 15 to select the numerical value setter DS4. For each output pulse of the circuit 4, a number of high-frequency pulses equal to the unit price set by the numerical setting device DS4 are added and counted, and the display circuit 22 displays the basic charge plus 1.
Displays the military fee from 12 skin WH's military fee plus 121 to 20 dish WH's consumption fee plus 201KWH to the current amount of power used. Toll counting circuit 1 remains active even after measurement operation has stopped.
If you want the display circuit 22 to hold the display without resetting the count value 3, as shown in FIG. An S flip-flop FF3 and an AND gate G5 may be used.

When the start signal is input, the R-S flip-flop F
F3 is set to open the frequency divider circuit 4 to allow the output pulses of the frequency divider circuit 4 to be sent to the first gate circuit 18 and the energy counting circuit 5, and to operate the single pulse generator circuit 12. and outputs a reset signal.
To stop the measurement operation, a stop signal is input to the R-S flip-flop FF3, which is reset, closes the AND gate G5, and the output pulse of the frequency divider circuit 4 is interrupted. Since the single pulse generation circuit 12 does not operate and no reset signal is output, the toll counting circuit 1
3 is not reset and its count value is held. The one shown in FIG. 2 is used, for example, when investigating how much electricity an electric refrigerator consumes in a day. FIG. 3 shows another embodiment of the present invention, in which the boundary value at which the unit price changes is set not by the amount of electricity but by the electricity rate.

Numeric value setting device D of boundary value setting section 25 unit price changes 1
The power rate for 2 dishes WH is set, and the power rate for 20 dishes WH is set in the numerical value setter DS6. Therefore, the power amount counting circuit 5 in FIG. 1 is no longer necessary, and the second comparison circuit i6 compares the count value of the fee counting circuit 13 with the boundary value. In the present invention, the boundary value setting section sets the boundary value of the amount of electricity or the electricity rate at which the unit price per unit amount of electricity changes, and the basic rate/unit price setting section sets the basic rate and a unit price that varies depending on the amount of electricity used. , at the start of counting, the first
Gate circuit, basic charge.

Through the operations of the unit price counting circuit, the first comparison circuit, the second gate circuit, and the basic charge/unit price selection circuit, the charge counting circuit counts the number of high-frequency pulses equal to the basic charge value, and the frequency dividing circuit counts one pulse. Each time the charge counting circuit counts the number of high-frequency pulses equal to the value of the unit price, the display circuit displays the counting circuit value of the charge counting circuit, and when the amount of electricity or the electricity price becomes equal to the boundary value, Since the unit prices are sequentially selected by the second comparison circuit, it is possible to display the charge for the amount of power used, that is, the sum of the basic charge and the consumption charge. This measures the effective use of electricity,
It can increase the power saving effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the invention, FIG. 2 is a block diagram showing a modification thereof, and FIG. 3 is a block diagram showing another embodiment of the invention. This is a diagram. 3...Power-frequency conversion circuit, 4...
- Frequency division circuit, 9... Basic charge/unit price setting section, 10... Boundary value setting section, 13... Charge counting circuit, 15... Basic charge/unit price selection circuit, 16... Second comparison circuit , 17・
...First comparison circuit, 18...First gate circuit, 19.
...Second gate circuit, 20...Oscillation circuit, 21...
Basic charge/unit price counting circuit, 22...Display circuit, 25
...Boundary value setting section. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A power-frequency converter circuit that detects electric power and outputs a pulse with a frequency proportional to the electric power; and a frequency divider circuit that converts the pulse output by the power-frequency converter circuit into one pulse per unit electric energy and outputs the pulse. , an oscillation circuit that outputs high-frequency pulses, a boundary value setting unit that sets a boundary value of the amount of electricity or electricity rate at which the unit price per unit amount of electricity changes, and a basic rate that sets the unit price that varies depending on the basic rate and the amount of electricity used.・A unit price setting section, a basic charge/unit price selection circuit that sequentially selects the basic charge and unit price set by the basic charge/unit price setting section each time a selection control signal is input, and a basic charge/unit price selection circuit that is opened by a reset signal or an output pulse of a frequency dividing circuit. A first gate circuit that is closed by the output of the first comparison circuit, a toll counting circuit and a basic charge/unit price counting circuit that count high frequency pulses of the oscillation circuit passing through the first gate circuit, and a toll counting circuit. A display circuit that displays the counted value as an electricity rate compares the counted value of the basic rate/unit price counting circuit with the value of the basic rate or unit price selected by the basic rate/unit price selection circuit, and the two become equal. a first comparison circuit which outputs an output at the same time and resets the basic charge/unit price counting circuit; and a first comparison circuit which is opened by the reset signal and sends the output of the first comparison circuit as a selection control signal to the basic charge/unit price selection circuit; The second gate circuit, which is closed by the delayed output of the circuit, compares the current amount of electricity or electricity rate with the boundary value, and when the two become equal, sends a selection control signal to the basic rate/unit price selection circuit. A power rate meter comprising a second comparison circuit.