JP2000009756A - Ampere-hour meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect the residual electrical quantity by taking the electrical quantity of a battery input through a switch as 100%, and bar-graph displaying the residual electrical quantity be percentage. SOLUTION: The actual capacity of a battery input by capacity setting switches 5, 6 is displayed as a residual electrical quantity on a residual electrical quantity display device 5. A current value flowing through a flow divider 11 is discriminated in the normal-reverse directions and is output by mV, and converted into a digital signal through a measured current input terminal 12 by an A/D converter 16. The converted digital signal is displayed as a measured current on a bar-graph display device 9 via a measured current (A) arithmetic circuit 25 and a bar graph (A) output circuit 26 and is calculated as an integrated electrical quantity (Ah). The residual capacity (%) arithmetic circuit 20 takes the input values from the switches 5, 6 as 100%, and obtains the percentage of the residual capacity (Ah) calculated by the residual capacity (Ah) arithmetic circuit 18 to be displayed on a bar-graph (%) display device 8 at a ratio of 10% per lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC integrated ammeter for measuring and managing the quantity of electricity of a battery mounted on a battery-driven vehicle or equipment.

[0002]

2. Description of the Related Art Conventionally, a commercially available general-purpose electricity counter or measuring instrument has been used to measure the amount of used electricity of a battery, and a remaining capacity meter of a battery voltage measuring type has been used for measuring and displaying the remaining capacity. The charge amount was controlled independently by a charge voltage and a charge time control circuit built in the charger.

[0003]

In the conventional electric quantity counter and DC integrating ammeter, only the function of counting and displaying the electric quantity is provided, and the remaining capacity meter is an indirect measurement for estimating the remaining capacity from the voltage of the battery. The error was large and only a guide. In addition, there is also a problem that the charging control is indirect control based on the charging voltage and time, so that liquid leakage and insufficient charging due to overcharging occur.

[0004] The present invention provides a function of displaying a real value of an accurate amount of remaining electricity and a visual display of a ratio of remaining amount of electricity, and appropriately charging a product obtained by multiplying the amount of used electricity by a charging coefficient as a required amount of charge. It is an object of the present invention to provide a DC integrating ammeter having the same.

[0005]

In order to achieve the above object, in a DC integrating ammeter according to the present invention, the same information is processed by using a basic circuit used for a conventional integrating ammeter or a coulomb counter as basic information. Circuits, that is, a remaining electric quantity (Ah) calculation display circuit, a remaining electric quantity (%) calculation display circuit, a necessary electric quantity calculation circuit for proper charging, and a balanced signal output circuit are provided.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. 1 is a front view of an embodiment of a DC integrating ammeter according to the present invention, FIG. 2 is a rear view thereof, FIG. 3 is a circuit configuration diagram, FIG. 4 is a flowchart showing a flow of a capacity setting process, and FIG.
FIG. 4 is a flowchart illustrating a flow of a measurement process.

In the embodiment of the present invention, an outer box is formed by a case 1 in which each circuit component is housed, a front panel 2 and a back panel 3. On the front panel 2, a digital display device 4 for remaining electric energy, and switches 5 and 6 for setting the electric capacity of the battery and a switch 7 for starting and stopping the measurement are attached to the display device 4. A bar graph (%) display device 8 for displaying the remaining amount of electricity (%) and a bar graph (A) display device 9 for displaying a current value for visually understanding the outline of the current value at the time of measurement are attached.

The rear panel 3 has an operation power input terminal 10,
Measurement current input terminal 1 for inputting the voltage signal of the shunt 11
2. A charge control balanced signal output terminal 13 and a charge coefficient input switch 14 are provided.

The basic configuration of the circuit according to the present invention is as follows. An amplifier 15 for amplifying a voltage value input from the shunt 11 as an information input circuit, and an A / A converter for converting an analog signal to a digital signal.
D converter 16 and integrated current value (Ah) calculation circuit 17
Consists of

A circuit for displaying the remaining electric quantity is a remaining capacity for digitally displaying the remaining electric quantity via a remaining capacity (Ah) calculating circuit 18 for calculating the remaining capacity based on the numerical values inputted by the switches 5 and 6 described above. (Ah) An output circuit 19, a remaining electricity digital display device 4, a remaining capacity (%) calculation circuit 20, a bar graph (%) output circuit 21, and a bar graph (%) display device 8. A circuit for obtaining an appropriate charge amount signal includes an electric quantity comparison circuit 22 for comparing the numerical values input to the switches 5 and 6 and the charge coefficient input switch 14 with a signal from the remaining capacity (Ah) calculation circuit 18 and performing an arithmetic operation. It comprises a balanced signal output circuit 23, a signal output relay 24, and a charge control balanced signal output terminal 13.

The visual display circuit of the measured current value includes a measured current value calculating circuit 25, a bar graph (A) output circuit 26, and a bar graph (A) display device 9 which receive the signal of the A / D converter 16 described above. Consists of

Further, in this embodiment, a circuit is provided which emits a warning sound by a buzzer or the like when the remaining amount of electricity becomes a certain amount, for example, 30% or less. Remaining capacity determination circuit 27 receiving the signal of
And a warning sound output circuit 28 and a buzzer 29.

The main circuit of the present invention and its function are described as follows.
The capacity setting switches 5 and 6 are switches for the user to input the actual capacity of the battery to be measured, and the unit is ampere / hour = Ah. The input value is displayed on the remaining electricity digital display 4.

The charge coefficient input switch 14 is a charge amount adjustment switch that varies depending on the type, model, manufacturing method, components and use conditions of the battery to be measured. The coefficient is between 1.00 and 0. 1.30 at 05 intervals
It is set to double.

The integrated current value (Ah) calculation circuit 17 calculates A / A
Lightning current value (mA) of digital signal from D converter 16
Is converted into an integrated current value (Ah).

The remaining capacity (Ah) calculation circuit 18 calculates the integrated current value (Ah) calculated by the integrated current value (Ah) calculation circuit 17 from the input values input by the capacity setting switches 5 and 6.
h) is a circuit for calculating the remaining capacity (Ah) by subtracting h) in consideration of the current polarity.

The remaining capacity (%) calculation circuit 20 sets the input value input by the capacity setting switches 5 and 6 to 100% and calculates the remaining capacity (Ah) calculated by the remaining capacity (Ah) calculation circuit as 1%.
This is a control circuit for determining the 00 fraction (%) and displaying it on the LED bar graph at a rate of about 10% per lamp.

The measurement current value (A) calculation circuit 25 has an A / D
The voltage value of the digital signal from the converter 16 is received and converted into a measured current value.
This is a control circuit for displaying an ED bar graph.

When the remaining capacity value reaches the set capacity value, the electric quantity comparison circuit 22 controls the balance signal, and the remaining capacity determination circuit 27 determines that the calculation result of the remaining capacity (%) calculation circuit 20 is constant. When the value becomes lower than the value, the warning sound (buzzer) output is controlled.

Next, the main operation flow of the present invention will be described in accordance with an embodiment. First, the actual capacity of the battery is input by the capacity setting switches 5 and 6. The input numerical value is displayed on the remaining electricity display 4 as the remaining electricity. Specifically, the switch 5 is a switch for inputting a numerical value in that digit, and is incremented by one each time 0 to 9 is pressed once. Each time the switch 6 is pressed for digit setting, the digit number + 1 is input.
For example, when inputting 52.0 Ah, the switch 6 is pressed once. When the switch 5 is pressed twice, 02.0 is displayed. Further, the switch 6 is pressed once, and the switch 5 is pressed five times.
2.0 is displayed. Then, when switch 7 is pressed once, 5
The capacity is set to 2.0 Ah and the measurement is started.

The value of the current flowing through the shunt 11 is divided into a forward current and a reverse current, ie, a discharge current and a charge current, and is output as mV. The analog signal is converted into a digital signal by the A / D converter 16 via the measurement current input terminal 12. . The converted (mV) digital signal is measured current (A) arithmetic circuit 2
5. The measured electric current is displayed on the bar graph (A) display device 9 via the bar graph (A) output circuit 26 as the measured electric current, and at the same time, the accumulated electric amount (A
h).

The remaining capacity (Ah) is indicated by the remaining capacity (Ah).
The remaining capacity is calculated by the arithmetic circuit 18 in consideration of whether the current is a discharge current or a charge current, or whether a charge coefficient is set. This is performed by the remaining capacity (Ah) output circuit 19 and the remaining capacity (Ah) display device 4. At the same time, the remaining capacity (%) calculation circuit 2
0, the remaining capacity (%) is displayed on the bar graph (%) display device 8 via the bar graph (%) output circuit 21.

The balance signal for charge control is output by a balance signal output circuit when the remaining capacity (Ah) calculated by the remaining capacity (Ah) calculation circuit 18 in the electric quantity comparison circuit 22 becomes equal to the set capacity value. 23, the ON signal is turned OFF from the balanced signal output terminal 13 by the balanced signal output relay 24, and OFF is set to O
The signal is converted to an N signal and output.

The warning sound is output from a warning sound output circuit 28 and a buzzer 29 via a remaining capacity determination circuit 27.

[0025]

As described above, the present invention has the following effects.

Since the amount of remaining electricity is digitally displayed as a real value, the amount of remaining electricity can be accurately known.

Since the amount of remaining electricity is displayed as a bar graph at a rate of 100%, it is easy to grasp the relationship between the amount of electricity used and the amount of remaining electricity.

Since the charge amount can be directly controlled as a required charge amount obtained by multiplying the amount of electricity used by the charge coefficient, proper charge can always be performed.

Further, the effect of the present invention is extremely large, for example, information obtained by a plurality of devices in the past can be obtained as more accurate direct information by a single device.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a DC integrating ammeter according to the present invention.

FIG. 2 is a rear view showing the embodiment of the DC integrating ammeter according to the present invention.

FIG. 3 is a circuit diagram showing an embodiment of a DC integrating ammeter according to the present invention.

FIG. 4 is a flowchart showing a flow of a capacity setting process of the embodiment of the DC integrating ammeter according to the present invention.

FIG. 5 is a flowchart illustrating a flow of a measurement process of the embodiment of the DC integrating ammeter according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Front panel 3 Rear panel 4 Digital residual electricity display device 5, 6, 7, 14 Switch 8 Bar graph (%) display device 9 Bar graph (A) display device 10 Operating power input terminal 11 Current shunt 12 Measurement current Input terminal 13 Charge control balanced signal output terminal 15 Amplification circuit 16 A / D converter 17 Accumulated electricity (Ah) operation circuit 18 Remaining capacity (Ah) operation circuit 19 Remaining capacity (Ah) output circuit 20 Remaining capacity (%) operation Circuit 21 Bar graph (%) output circuit 22 Electric quantity comparison circuit 23 Balanced signal output circuit 24 Balanced signal output relay 25 Measurement current (A) calculation circuit 26 Bar graph (A) output circuit 27 Remaining capacity judgment circuit 28 Warning sound output circuit 29 Buzzer

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[Procedure amendment]

[Submission date] October 14, 1998 (1998.10.
14)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of the Invention] Integrating ammeter

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2G016 CA00 CA03 CB03 CB21 CB22 CC04 CC05 CC06 CC12 CC16 CD02 CD03 CE02 CE07 2G035 AA01 AA21 AA22 AA24 AB03 AC02 AC12 AD20 AD23 AD28 AD40 AD42 AD44 AD54 AD65 3D020 BA03 BB01 BB02 BB02 BD05

Claims (2)

[Claims] 1. A switch for inputting the amount of electricity (Ah) of the battery, an arithmetic circuit and an output circuit capable of displaying the remaining amount of electricity as a bar graph in 100% (%) with the inputted amount of electricity being 100%, and DC integrating ammeter with residual electricity display. 2. A switch capable of inputting a charging coefficient in accordance with the charging characteristics of a battery to be charged, and an operation capable of outputting a signal to a charger as a proper charging electric quantity by multiplying a used electric quantity of the battery by the charging coefficient. DC integrating ammeter with circuit and balanced signal output circuit.