| 摘要 |
PURPOSE:To display in a simple and proper way the residual capacity of a storage battery, by controlling a counter via a timer and in response to a detected discharge factor obtained from the difference between the holding voltage and the circuit voltage. CONSTITUTION:When a storage battery 1 is discharged by the function of a load 2, the output is kept at a low level for an operational amplifier 5 to which the circuit voltage is applied. Then an up-down counter 11 is counted down, and at the same time a timer 13 is selected via a switch 14. While the outputs of corresponding operational amplifiers 6-10 at a discharge factor detecting part B are set successively at a high level in response to the discharge factor. Then IC switches 17-20 are switched. As a result, the time constant of the timer 13 is controlled in response to the discharge factor, and the timer clock width varies. The varying speed of the count value of the counter 11 changes in response to the discharge factor. Then the residual capacity of the battery 1 is displayed at a residual capacity display voltmeter 69 having 100% initial value in response to the count value of the counter 11. In such a way, the residual capacity of a storage battery can be displayed in a simple and proper way by a system requiring no detection of the branched current or the specific gravity of electrolyte. |
