Patent ID: 8085001
Filing Date: 2011-12-27
Classification: H02J

Abstract:
1. A battery charging control circuit, comprising: a constant-current charging unit configured for charging the rechargeable battery in a constant-current mode, wherein, the constant-current charging unit comprises a resistor which is connected between a power source and a branch switch; a detection switch configured for turning on or off depending on the enable or disable state of the constant-current charging unit, wherein, the detection switch is a low voltage activated switch comprising a control terminal, a first path terminal, and a second path terminal, the first path terminal of the detection switch is connected to the power source, the second path terminal of the detection switch is grounded, and the control terminal of the detection switch is connected to a connection node of the constant-current charging unit and the branch switch; the branch switch connected between the constant-current charging unit and the rechargeable battery, and configured for enabling or disabling the constant-current charging unit, wherein, the branch switch comprises a first switch and a first resistor, a control terminal of the first switch is connected to the control unit, a first path terminal of the first switch is connected to the control terminal of the detection switch, a second path terminal of the first switch is connected to the anode of the rechargeable battery; the first resistor is connected between the control terminal and the first path terminal of the first switch; and a control unit connected with the detection switch and the branch switch, and configured for controlling the branch switch to turn off when the detection switch is turned on, and controlling the branch switch to turn on when the detection switch is turned off.