The present invention provides a battery charging circuit to charge batteries in phases. In a first charging phase the charging circuit charges the batteries with a large current and at a second charging phase the charging circuit charges the batteries with a much smaller current. The charging circuit includes a current detection circuit which detects a charge current and provides a detection voltage proportional to the charge current. The battery charging circuit also includes an amplifier circuit to amplify the detection voltage and a comparison module compares the amplified detection voltage with a reference voltage. If the amplified detection voltage is lower than the reference voltage, the comparison module outputs a switch signal to a control module. The control module controls a charging module to charge the battery in a trickle mode when receiving the switch signal.
申请公布号
US2009058369(A1)
申请公布日期
2009.03.05
申请号
US20080166270
申请日期
2008.07.01
申请人
HONG FU JIN PRECISION INDUSTRY (SHENZHEN) CO., LTD;HON HAI PRECISION INDUSTRY CO., LTD.
发明人
WANG HAN-CHE;ZHAO XIN;OUYANG HONG-SHENG;LI XIAO-GUANG;CHUNG SHIN-HONG