ELECTRIC CELL PACK BUILT-IN CHARGING CIRCUIT

摘要

PURPOSE: The charging circuit enables the charging by the general DC voltage and makes the charging easy, by installing a simple charging circuit inside an electric cell pack without using a special charger. CONSTITUTION: The electric cell pack built-in charging circuit can charge a secondary cell(80) without comprising an additional charger by comprising: a power source part(10) supplying power by rectifying after converting a DC power applied from the external power source into an AC power; a charging circuit(70) charging the secondary cell by varying the output voltage, by restricting current by adjusting the voltage value corresponding to the current detected from the secondary cell and by performing the ON/OFF control of a FET at a constant time intervals as to a frequency signal generated from an oscillation part; and a display part(90) displaying the charging state visually by sensing the charging state of the secondary cell from the charging circuit.