Patent ID: 7034505
Filing Date: 2006-04-25
Classification: H02J

Abstract:
1. A charging system comprising: a first charging circuit which is provided in a mobile apparatus having a secondary buttery and a power-source circuit, and a second charging circuit which is provided in a charging device for supplying power to the first charging circuit, wherein the second charging circuit provided in the charging device comprises: a first output terminal for outputting a DC voltage; a second output terminal for outputting a charging voltage for the secondary buttery of the mobile apparatus; a third terminal connected to ground; and a charge-control unit for causing the second terminal to output DC voltage as a charging voltage, and wherein the first charging circuit provided in the mobile apparatus comprises: a first input terminal for receiving the DC voltage when connected with the first output terminal of the second charging circuit; a second input terminal for receiving the charging voltage when connected with the second output terminal of the second charging circuit; a third input terminal to be connected to ground when connected with the third output terminal of the second charging circuit; a switching control unit for switching a power supply source to the power-source circuit of the mobile apparatus from the secondary buttery to the first input terminal to apply the charging voltage received by the second input terminal to the secondary buttery, when the mobile apparatus is installed on the charging device; a detecting unit for detecting whether or not the mobile apparatus has been installed on the charging device; a power-source control unit for generating and applying a power-source control signal to the power-source circuit of the mobile apparatus based on the resultant of detection by the detecting unit; a charge-control signal generating unit for generating a charge-control signal based on the resultant detection by the detecting unit and the power-source control signal generated by the power-source control unit; and a conduction switching unit for making conduction between the second input terminal and the secondary buttery of the mobile apparatus based on the charge-control signal generated by the charge-control signal generating unit.