JP2001016794A - Calculating circuit for required charging time - Google Patents

Abstract

PROBLEM TO BE SOLVED: To calculate accurately a required charging time, by computing through a computing means the required charging time based on the corrected parameters of measured charging curves read, in the computing means from a correcting means. SOLUTION: A computing means 11 reads the parameters of presently measured charging curves to output these parameters to a measurement memory 12 at a fixed time interval. The measurement memory 12 stores as measured values these parameters of the presently measured charging curves. A correcting means 13 averages the parameters of the presently measured charging curves and the parameters of past measured charging curves stored in a memory 6 to correct the parameters. The computing means 11 reads the corrected parameters of the measured charging curves from the correcting means 13 and computes a required charging time to thereafter output it to a displaying means 8 and display it therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new charging curve parameter (temperature, charging current, battery voltage) of a charging curve (change of voltage value over time) stored in a memory for each charge. The present invention relates to a required charging time calculation circuit capable of calculating an accurate required charging time because the correction is performed according to the value.

[0002]

2. Description of the Related Art FIG. 3 is a circuit diagram showing a conventional charging time calculating circuit disclosed in, for example, Japanese Patent Application Laid-Open No. 10-42483. In the drawing, reference numeral 1 denotes a power supply for supplying charging power, and 2 denotes lithium. Temperature detecting means for detecting the temperature of the ion battery 3, 3 is a lithium ion battery charged by the power supply 1, 4 is current detecting means for detecting the charging current of the lithium ion battery 3, 5 is the lithium ion battery 3
Voltage detecting means for detecting the voltage between both ends of the circuit through a resistor R, 6
Is a memory for storing parameters (temperature, charging current, battery voltage) of a preset charging curve of the lithium ion battery 3, and 7 is a charging time based on the parameters stored in the memory 6 based on the voltage at both ends and the charging current. Is a display means for displaying the required charging time calculated by the calculation means 7.

Next, the operation will be described. The voltage detecting means 5 detects the voltage between both ends of the lithium ion battery 3 and if the voltage between both ends is equal to or less than the set voltage, the calculating means 7 reads the parameters stored in the memory 6 and calculates the required charging time. Is displayed on the display means 8.
On the other hand, if the voltage at both ends is not equal to the set voltage, the operation is abnormally stopped.
If the detected charging current is the termination current, the operation is terminated. If the charging current is not the termination current, the calculation means 7 reads the parameters of the charging curve stored in the memory 6 and reads the required charging time. Is calculated, and the required charging time is displayed on the display means 8. Further, based on the temperature detected from the lithium ion battery 3 by the temperature detecting means 2, the calculated required charging time is corrected and displayed.

[0004]

Since the conventional required charging time calculation circuit is constructed as described above,
Read the parameters of a constant charging curve stored in the memory 6 and calculate the required charging time. However, when the lithium ion battery 3 is deteriorated, the battery capacity is reduced and the charging time is shortened. However, since such measured parameter fluctuations are not corrected at any time, the parameter values of the measured charging curve and the memory 6 are not corrected. There is a problem that an error occurs with the parameter value of the charging curve stored in the storage device, and it is not possible to calculate an accurate required charging time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. The present invention corrects the parameters of the charging curve stored in the memory in accordance with the actually measured parameter values of the charging curve for each charge. It is another object of the present invention to provide a required charging time calculating circuit capable of calculating an accurate required charging time.

[0006]

According to the present invention, there is provided a circuit for calculating a required charging time based on a parameter of a past charging curve stored in a memory by a correction means based on a parameter of a charging curve stored in an actual measurement memory. The memory contents are updated with the corrected charging curve parameters, and the required charging time is calculated based on the corrected charging curve parameters read from the correcting means by the calculating means.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a configuration diagram showing a charging time calculation circuit according to Embodiment 1 of the present invention.
1 is a power supply for supplying charging power, 2 is a temperature detecting means for detecting the temperature of a lithium ion battery (battery) 3, 3 is a lithium ion battery charged by the power supply 1, 4
Is a current detecting means for detecting the charging current of the lithium ion battery 3, 5 is a voltage detecting means for detecting the voltage across the lithium ion battery 3 via the resistor R, and 6 is a predetermined charging curve of the lithium ion battery 3. A memory for storing parameters (temperature, charging current, battery voltage), and a display means 8 for displaying the required charging time calculated by the calculating means 11.

Reference numeral 11 denotes parameters of the actually measured charging curve (charging current of the current detecting means 4, voltage across the voltage detecting means 5,
And the temperature of the temperature detecting means 2), and outputs the read parameters of the charging curve to the actual measurement memory 12 at fixed time intervals, and based on the corrected charging curve parameters read from the correcting means 13, the required charging time Is a calculating means for calculating. Reference numeral 12 denotes an actual measurement memory for inputting and storing the parameters of the actually measured charging curve output from the calculating means 11, and reference numeral 13 denotes the parameters of the past charging curve stored in the memory 6 and the actually measured charging stored in the actual measurement memory 12. A correction means for correcting by averaging the parameters of the curve and outputting the corrected parameters of the charging curve to the calculating means 11 and storing the corrected parameters of the charging curve in the memory 6.

Next, the operation will be described. FIG. 2 is a flowchart showing an operation procedure of the required charging time calculation circuit according to the first embodiment of the present invention. First, the calculating means 11 reads the parameters of the actually measured charging curve (charging current of the current detecting means 4, voltage across the voltage detecting means 5, and temperature of the temperature detecting means 2) (step ST1). Is output to the measurement memory 12 at regular time intervals (step ST2). The actual measurement memory 12 stores these parameters of the charging curve as actual measured values (step ST3).

Next, the correcting means 13 corrects by averaging the parameters of the actually measured charging curve read via the calculating means 11 and the parameters of the past charging curve stored in the memory 6 (step ST4). Then, the parameters of the corrected charging curve are recorded as new parameters of the charging curve in the memory 6 (step ST5). Also,
The calculating means 11 reads the corrected parameters of the charging curve from the correcting means 13 and calculates the required charging time (step ST6). After that, the charging time is displayed on the display means 8.
And the display means 8 displays this required charging time (step ST7).

As described above, according to the first embodiment, the correction means 13 corrects the parameters of the charging curve stored in the memory 6 for each charge according to the actually measured parameter values of the charging curve. Since the means 11 calculates the required charging time based on the corrected parameters of the charging curve, the parameter values of the charging curve stored in the memory 6 change due to the deterioration of the lithium ion battery 3 or the like. In such a case, it is possible to obtain an effect that an accurate charging time can be calculated.

[0012]

As described above, according to the present invention, the correction means corrects the parameters of the past charging curve stored in the memory in advance based on the parameters of the charging curve stored in the actual measurement memory. The memory contents are updated with the corrected charging curve parameters, and the required charging time is calculated based on the corrected charging curve parameters read from the correcting means by the calculating means. Even when the parameter value of the charging curve stored in the memory changes, there is an effect that an accurate required charging time can be calculated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a required charging time calculation circuit according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation procedure of a required charging time calculation circuit according to the first embodiment of the present invention.

FIG. 3 is a circuit diagram showing a conventional required charging time calculation circuit.

[Explanation of symbols]

3 Lithium ion battery (battery), 6 memory, 8
Display means, 11 calculation means, 12 actual measurement memory, 13
Correction means.

Claims (1)

[Claims] 1. A charging time calculating circuit for calculating and displaying a required charging time based on parameters of a measured charging curve of a battery and parameters of a charging curve of a battery stored in a memory in advance. A measured memory for storing the parameters at predetermined time intervals, and a parameter of a past charging curve stored in advance in the memory is corrected based on a parameter of the charging curve stored in the measured memory. And a calculating means for calculating a required charging time based on the corrected charging curve parameter read from the correcting means. Time calculation circuit.