Patent ID: 8331112

Claim:
A system for regulating an output voltage of a power conversion system, the system comprising: an error amplifier coupled to a capacitor, the error amplifier being configured to receive a reference voltage, a first voltage, and an adjustment current and to generate a compensation voltage with the capacitor, the first voltage being associated with a feedback voltage; a current generator configured to receive the compensation voltage and generate the adjustment current and a first current; a signal generator configured to receive the first current and a second current, the signal generator being further configured to receive a sensing voltage and to generate a modulation signal; the gate driver directly or indirectly coupled to the signal generator and configured to generate a drive signal based on at least information associated with the modulation signal; and a switch configured to receive the drive signal and affect a primary current flowing through a primary winding coupled to a secondary winding; wherein: the secondary winding is associated with an output voltage and an output current of a power conversion system, the power conversion system including at least the primary winding and the secondary winding; the feedback voltage depends on at least the output voltage and the output current; and the sensing voltage depends on at least the primary current; wherein: the error amplifier is characterized by at least a transconductance and further configured to change the transconductance based on at least information associated with the adjustment current; and the transconductance decreases with the decreasing output current of the power conversion system.