Patent ID: 8917062
Filing Date: 2014-12-23
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 first transistor being coupled between the first common node and the second common node, the charge control circuit comprising: a detecting device for detecting an operation parameter of the first transistor and controlling an internal voltage source to generate a non-predetermined voltage difference accordingly; a charge control unit for controlling a conductive state of the first transistor; and a first error amplifier circuit for generating and transmitting a control signal to the regulator circuit according to a voltage at the first common node, a sum of a voltage at the second common node and the non-predetermined voltage difference, and a reference voltage; whereby when the sum of the voltage at the second common node and the non-predetermined voltage difference is smaller than the reference voltage, the voltage at the first common node is regulated to a predetermined level; and when the sum of the voltage at the second common node and the non-predetermined voltage difference is equal to or higher than the reference voltage, the voltage at the first common node is regulated to a level higher than the voltage at the second common node, and the first transistor is in an optimum conductive state.