CHARGE CONTROL CIRCUIT AND PORTABLE DEVICE

PROBLEM TO BE SOLVED: To provide a charge control circuit capable of accurately detecting a charging current flowing to a secondary battery without being influenced by the current consumed at each part of equipment and supplying power from the secondary battery without voltage loss at a non-charging time. SOLUTION: Only the resistance of a substrate pattern and connector contact between an equipment main unit and a secondary battery (between point A and point B) that is necessarily produced is used in place of a resistor for charging current sensing. For this reason, it is possible to accurately detect only a charging current flowing to the secondary battery 3 and to complete charging operation without fail regardless of equipment current. Power supplied to each part of equipment is taken out between point A and a backflow preventing element 6. For this reason, it is possible to supply power from the secondary battery to each part of equipment without voltage loss even at a non-charging time. COPYRIGHT: (C)2009,JPO&INPIT