| 摘要 |
The charge control circuit for converting the charging current of battery to frequency signal to display the charging state of the battery comprises a constant voltage supply unit (1), a voltage/ frequency converter (2) for detecting a voltage between both ends of a resistor (R1) and supplied from the unit (1) to the battery (Bt1) through a diode (D1) to convert the voltage to frequency signal, a counter (3) receiving the freq.-converted pulse signal from the converter (2), an A/D converter (4) for converting an output of the counter (3) to an analog signal, a control unit (5) for receiving an output of the A/D converter (4) to control the constant voltage supply unit (1) and a display unit (6) for displaying the charging state.
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