Battery charging circuit and method

The present invention provides a battery charging circuit, the battery charging circuit to simplify the structure of a conventional battery charging circuit in a feedback control circuit, a comparator is used to realize the difference between the adjusted feedback signal with a reference signal, the output logic level form feedback control signal, various feedback control circuit automatically switch between, effectively avoid erroneous switching and multiple feedback control circuit simultaneously occurs and the circuit has good portability. At the same time, due to the fixed length of time or a fixed duration turned off control mode, the circuit structure is more easy integration.