Patent ID: 9007035
Filing Date: 2015-04-14
Classification: H02J

Abstract:
1. A charge control circuit for supplying power from an external power source to a first common node and charging a second common node from the first common node, a regulator circuit being coupled between the external power source and the first common node, and a transistor being coupled between the first common node and the second common node, the charge control circuit comprising: a current sensing and control device, for sensing a current from the first common node to the second common node and generating a first control signal, wherein the first control signal is not transmitted to a gate of the transistor to control the transistor but is sent to the regulator circuit; a first voltage sensing and control device, for sensing a voltage at the first common node and generating a conduction control signal to decide a conduction status of the transistor, wherein the gate of the transistor receives the conduction control signal but does not receive the first control signal; and a second voltage sensing and control device, for sensing a voltage at the second common node and generating a second control signal which is sent to the regulator circuit; wherein the regulator circuit provides system power to the first common node according to the first control signal and the second control signal.