Patent ID: 8570771

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; and a driving component configured to generate a drive signal based on at least information associated with the modulation signal and output the drive signal to a switch in order to affect a third current flowing through a primary winding of a power conversion system; wherein: the feedback voltage is associated with an output voltage and an output current of the power conversion system; and the sensing voltage is associated with the third current; wherein: the error amplifier is characterized by a transconductance; and the error amplifier is further configured to change the transconductance based on at least information associated with the adjustment current so that the transconductance decreases with the decreasing output current of the power conversion system.