Patent ID: 7834588
Filing Date: 2010-11-16
Classification: H02J

Abstract:
1. A charging device capable of providing backflow current and inrush current protection comprising: a reception end for receiving a charging voltage; a rechargeable battery; and a dynamic protection unit, coupled between the reception end and the rechargeable battery, for controlling connection between the reception end and the rechargeable battery according to a control signal and a connection condition between the reception end and the charging voltage; wherein the dynamic protection unit cuts off a current path between the reception end and the rechargeable battery according to a first voltage level of the control signal and a voltage of the rechargeable battery when the connection between the reception end and the charging voltage is removed, and conducts the current path between the reception end and the rechargeable battery according to a second voltage level of the control signal and the charging voltage when the charging voltage is connected to the reception end; wherein the dynamic protection unit comprises: a current generation unit, coupled between the reception end and the rechargeable battery, for generating a charging current and a corresponding current path; a switch unit for outputting a greater voltage from the voltage of the rechargeable battery and the charging voltage to the current generation circuit so as to prevent current leakage on the corresponding current path and accordingly achieve the inrush current protection; and a control unit, comprising a first end and a second end coupled to bias ends of the current generation unit and a third end coupled to the switch unit, for controlling connection between the bias ends of the current generation unit according to the voltage level of the control signal and a voltage outputted by the switch unit.