Patent ID: 9088218
Filing Date: 2015-07-21
Classification: H02M,H05B,Y02B

Abstract:
1. A system controller for regulating an output current of a power conversion system, the system controller comprising: a driving component configured to output a drive signal to a switch in order to affect a primary current flowing through a primary winding of the power conversion system, the drive signal being associated with at least a switching period, the switching period including an on-time period and a demagnetization period; a demagnetization detector configured to receive a feedback signal associated with an output voltage of the power conversion system and generate a detection signal based on at least information associated with the feedback signal, the detection signal indicating the demagnetization period; a current-regulation component configured to receive the drive signal, the detection signal and a current-sensing signal and output a current-regulation signal based on at least information associated with the drive signal, the detection signal, and the current-sensing signal, the current-sensing signal representing the primary current in magnitude; and a signal processing component configured to receive the current-regulation signal and output a processed signal to the driving component in order to generate the drive signal; wherein the driving component includes: a flip-flop component configured to receive the processed signal and a first signal and output a second signal based on at least information associated with the processed signal and the first signal; and a driver configured to receive the second signal and output the drive signal based on at least information associated with the second signal.