JPS6014308B2 - electricity bill meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power meter that contributes to power saving.

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 the sum of the basic fee and the amount-of-use fee, which is based on a unit price that varies depending on the amount of power used. Therefore, it is unreasonable for general consumers to use conventional watt-hour meters as a means for grasping the usage status of electric power, and the power saving effect is not improved. An object of the present invention is to provide an electric power rate meter that momentarily subtracts the charge for the used fin power from a set target amount and displays the remaining amount with respect to the target amount.

The present invention will be explained below with reference to the drawings.

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. It is then converted into a pulse with a frequency proportional to the crab force. This pulse is frequency-divided by a frequency dividing circuit 4 at a rate of one pulse per unit electric energy. The basic charge/unit price setting unit 5 consists of four numerical value setters DS, DS2, DS3, and DS4.
The unit price per unit power up to 20KWH can be determined using the numerical setting device D.
For example, a unit price of 121 KWH or more and 200 KWH or less is set in S3, and a unit price of 201 KWH or more, for example, is set in numerical setting device DS4.

The boundary value setting unit 6 consists of one numerical value setting device DS5, DS6, and boundary values of the electric energy at which the unit price changes, for example, 12 dishes WH and 20 dishes WH, are respectively set in these numerical value setting devices DS5, DS6. In the target amount setting section 7, a target amount of electricity charges for a certain period of time, for example, one month is set. At the start of power rate measurement, a start signal is input to the set input state S of the R-S flip-flop FF3 and the single pulse generation circuit 8. As a result, the R-S flip-flop F
F3 becomes set state, opens AND gate G5,
The output pulse of the frequency dividing circuit 4 is transmitted to the power military counting circuit 9 and the first
It becomes possible to input the signal to the OR gate G of the gate circuit 10. The single pulse generation circuit 8 generates a single pulse reset signal, and resets the frequency dividing circuit 4, the electric energy counting circuit 9, the boundary value selection circuit 11, and the basic charge/unit price selection circuit 12. As a result, the boundary value selection circuit 11 selects the numerical value setter D and outputs the set value 120 (KWH) to the second comparison circuit 13. Further, the basic charge/unit price selection circuit 12 outputs the value of the basic charge set in the numerical value setter DS to the first comparison circuit 14. Single pulse generation circuit 8
The reset signal output from the R-S flip-flop FF4 is inputted to the reset input terminal R of the R-S flip-flop FF4 to set it in a reset state, and the reset output causes the ±display circuit 1
Display 5 to 10. At the same time, an R-S flip-flop FF is connected to the up-down switching input terminal U/D of the remaining amount counting circuit 16, which is a presettable up-down counter.
Since a low level signal is added from 4, the subtraction operation is set. The remaining amount counting circuit 16 inputs the target amount set by the target amount setting section 7 as a preset value by inputting the set signal from the single pulse generation circuit 8 to the preset terminal PE, and stores it. Further, the reset signal is input to the R-S flip-flop FF through the OR gate G of the first gate circuit 10, and sets this to open the AND gate G2. Further, the reset signal is input to the R-S flip-flop FF2 of the second gate circuit 17, and is set to open the AND gate G3. With the opening of AND Gate G2,
The high frequency pulses output by the oscillation circuit 18 are input to the basic charge/unit price counting circuit 19 and counted, and are also input to the remaining amount counting circuit 16 to subtract the number of high frequency pulses from the target amount.

Basic charge. When the unit price counting circuit 19 counts the number of high-frequency pulses equal to the value of the basic charge, the first comparator circuit 14 sends its output to the R-S flip-flop FF to reset it, and closes the AND gate G2. The input of high frequency pulses to the remaining amount counting circuit 16 and the basic charge/unit price counting circuit 19 is cut off. Therefore, the count value of the remaining amount counting circuit 16 is (target amount - basic fee),
The display circuit 20 displays the remaining amount. At the same time, based on the output of the first comparison circuit 14, the basic charge/unit price counting circuit 19
will be reset. Further, the output of the first comparison circuit 14 is passed through an AND gate G3 and an OR gate G4 as a selection control signal to the clock terminal CL of the basic charge/unit price selection circuit 12.
and select the numerical value setter DS2. As a result, the unit price up to 120KWH set in the numerical value setter DS2 is output to the first comparison circuit 14. The output of the first comparison circuit 14 is delayed by the delay circuit 21 and input to the reset input terminal R of the R-S flip-flop FF2, which is reset and the AND gate C3 is closed. When a unit power amount (for example, IKWH) is consumed and the frequency dividing circuit 4 outputs one pulse, this pulse passes through an AND gate Q and is counted by the power amount counting circuit 9. At the same time, this pulse passes through the OR gate G, and the R-S flip-flop FF. input to the set input terminal S of , and sets this to open the AND gate G2. The high frequency pulses of the oscillation circuit 18 are input to the remaining amount counting circuit 16 and the basic charge/unit price counting circuit 19, and are counted up to the unit price value set by the numerical setting device DS2. Basic charge/unit price counting circuit 19
When the count value of becomes equal to the setting value of the numerical value setter DS2,
The first comparator circuit 14 provides an output. With this output, R-
The S flip-flop FF is reset, closes the AND gate G2, and resets the basic charge/unit price counting circuit 19. The count value of the remaining amount counting circuit 16 is (target amount - basic fee - IKWH fee based on the unit price of up to 12 dishes WH), and the display circuit 20 displays this count value as the remaining amount. The output of the first comparison circuit 14 is output from the delay circuit 21.
The signal is input to the reset input terminal R of the R-S flip-flop FF2 through the R-S flip-flop FF2, but since the R-S flip-flop FF2 is in the reset state, does not change. In this way, each time the frequency dividing circuit 4 outputs one pulse, the remaining amount counting circuit 16 subtracts and counts the number of high-frequency pulses equal to the unit price value, and the display circuit 20' always displays the remaining amount relative to the target amount. do. The count value of the power consumption counting circuit 9 is set by the value setter D.
When the value becomes equal to the boundary value (120KWH) set by
At the same time, the selection control signal is sent to the OR gate G4.
The data is sent to the basic charge/unit price selection circuit 12, and the value setter DS3 is made to select the value.

Between 121 and 200 KWH, each time the frequency dividing circuit 4 outputs one pulse, the remaining amount counting circuit 16 sets the value setting device D.
The display circuit 20 subtracts and counts the number of high-frequency pulses equal to the unit price value set in S3, and the display circuit 20 displays (Target amount - Basic charge - Metered charge for 1 to 12 skin WH - Military charge from 121 KWH to the current power consumption) Display.

Similarly, when the electric energy reaches 20 WH, the second comparison circuit 13 sends a selection control signal to the basic charge/unit price selection circuit 12 to select S4 of the numerical value setter, and thereafter the remaining charge counting circuit 16 For each output pulse of the frequency dividing circuit 4, the display circuit 20 subtracts and counts a high frequency pulse equal to the unit price value set by the numerical setting device S4, and the display circuit 20 displays (target amount - basic price - 1 to 12 female WH). Displays the usage fee for the 121 to 20 side WHs - the usage fee for the 20-dish WH up to the current amount of power used. During the measurement operation, the remaining amount counting circuit 1
When the count value of 6 becomes zero, that is, when the electricity rate becomes equal to the target amount, the all-digit zero detection circuit 23 detects this and sets the R-S flip-flop FF4.
The ±display circuit 15 displays one.

At the same time, the set output of the R-S flip-flop FF4 is connected to the up/down switching input terminal U/ of the remaining amount counting circuit 16.
D and switches it to addition operation. Thereafter, the remaining amount counting circuit 16 adds and counts the high frequency pulses,
The display circuit 20 displays the counted value as a minus, and this counted value means the amount exceeding the target amount. Stop signal is R-S
When input to flip-flop FF3, AND gate ○
5 closes and the measurement operation stops.

However, the count value of the remaining amount counting circuit 16 is held as is, and the display circuit 20 and ± display circuit 15 continue to display. Next, when a start signal is input, the remaining amount counting circuit 16 is reset to the target amount. As the remaining amount counting circuit 16, a presettable down counter that performs only a subtraction operation can also be used.

The all-digit zero detection circuit 23 can issue an alarm when the electricity rate becomes equal to the target amount.
If you want to know the amount of power used, a display circuit may be provided in the power amount counting circuit 9. The boundary value setting unit 6 can set the boundary value based on the power rate instead of setting the boundary value based on the amount of electric power. In this case, the numerical value setters Dmi and DS6 have a large number of digits. In place of the electric energy counting circuit 9, a charge counting circuit is provided which adds and counts the high frequency pulses passing through the AND gate G2. In the present invention, the boundary value setting section sets the boundary value of the amount of electricity or electricity rate at which the unit price per unit electricity or energy 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. Then, the target amount setting section sets the target amount of electricity charges, and at the start of measurement, the first gate circuit,
By the operation of the basic charge/unit price counting circuit, the first comparison circuit, the second gate circuit, and the basic charge/unit price selection circuit, the remaining amount counting circuit preset to the target amount generates a number of high-frequency pulses equal to the value of the basic charge. is subtracted from the target amount, and each time the frequency dividing circuit outputs one pulse, the remaining amount counting circuit subtracts and counts the number of high-frequency pulses equal to the unit price value, and the remaining amount counting circuit displays the counted value. The circuit displays the remaining amount, and when the amount of electricity or the electricity price becomes equal to the boundary value, the second comparison circuit selects the unit price in sequence, so the basic charge and the consumption charge are subtracted from the set target amount. The remaining amount can be displayed.

This makes it possible to save and improve the amount of power used.

[Brief explanation of the drawing]

The drawing is a block diagram showing one embodiment of the present invention. 3... Power-frequency conversion circuit, 4... Frequency dividing circuit, 5...
・Base charge/unit price setting section, 6... Boundary value setting section, 7.
...Target amount setting section, 10...First gate circuit, 12
...Basic charge/unit price selection circuit, 13...Second comparison circuit,
14... First comparison circuit, 16... Remaining amount counting circuit, 17... Second gate circuit, 18... Oscillation circuit, 19...
- Counting circuit for basic charge/unit price, 20...display circuit.

Claims (1)

[Claims] 1. A power-to-frequency conversion circuit that detects electric power and outputs a pulse with a frequency proportional to the electric power, and a frequency dividing circuit that converts the pulse output by the power-to-frequency conversion 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. - Basic rate/unit price selection that selects the basic rate and unit price set by the unit price setting section, the target amount setting section that sets the target amount of electricity rate, and the basic rate/unit price setting section each time a control signal is input. circuit, a first gate circuit that is opened by the reset signal or the output pulse of the frequency dividing circuit and closed by the output of the first comparison circuit, and a target amount set by the target amount setting section as a preset value; a remaining amount counting circuit that subtracts the number of high-frequency pulses of the oscillation circuit that passes through the target amount from the target amount; a display circuit that displays the counted value of the remaining amount counting circuit as the remaining amount; and an oscillation circuit that passes through the first gate circuit. The basic charge/unit price counting circuit that counts high-frequency pulses compares the count value of the basic charge/unit price counting circuit with the basic charge or unit price value selected by the basic charge/unit price selection circuit, and determines that both are equal. A first comparator circuit outputs an output when the basic charge/unit price counting circuit is opened and is opened by the reset signal, and sends the output of the first comparator 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 first comparison circuit, compares the current power amount or power rate with the boundary value, and when the two become equal, sends a selection control signal to the basic rate/unit price selection circuit. and a second comparison circuit that sends a power rate meter.