Patent ID: 8228692

Claim:
A switching-mode power conversion system, the system comprising: a primary winding configured to receive an input voltage; a secondary winding coupled to the primary winding; a compensation component configured to receive the input voltage and generate at least a clock signal based on at least information associated with the input voltage; a signal generator configured to receive at least the clock signal and generate at least a control signal based on at least information associated with the clock signal; a gate driver configured to receive at least the control signal and generate a drive signal based on at least information associated with the control signal; and a first switch configured to receive the drive signal and affect a first current flowing through the primary winding; wherein: the drive signal is associated with a switching frequency; the switching frequency varies with the input voltage in magnitude; and the compensation component includes at least a voltage sensing component and a current generator; wherein: the voltage sensing component is configured to receive the input voltage and generate a detected voltage based on at least information associated with the input voltage; the current generator is configured to receive the detected voltage and generate at least a second current based on at least information associated with the detected voltage corresponding to a detected voltage magnitude, the second current corresponding to a first current magnitude; and the first current magnitude varies with the detected voltage magnitude; wherein: the current generator is further configured to generate a third current based on at least information associated with the detected voltage, the third current corresponding to a second current magnitude; and the second current magnitude varies with the detected voltage magnitude.