Patent ID: 8305776

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 and configured to, with one or more first components, generate, at an output terminal, an output voltage and an output current; an auxiliary winding coupled to the secondary winding and configured to, with at least one or more second components, generate, at a first terminal, a detected voltage; an error amplifier configured to receive the detected voltage and a predetermined reference voltage and generate an amplified voltage based on at least information associated with a difference between the detected voltage and the predetermined reference voltage; a compensation component configured to receive the amplified voltage and generate a compensation current based on at least information associated with the amplified voltage, the compensation current flowing between the first terminal and the compensation component; a signal generator configured to receive at least the amplified voltage and generate one or more control signals based on at least information associated with the amplified voltage; a gate driver configured to receive the one or more control signals and generate a drive signal based on at least information associated with the one or more control signals; and a switch configured to receive the drive signal and affect a first current flowing through the primary winding; wherein: the one or more first components include a first diode, through at least the first diode the secondary winding being coupled to the output terminal; the compensation component is further configured to generate the compensation current such that the output voltage is substantially independent of the output current; wherein: the compensation component includes a compensation transistor, a compensation amplifier, and a compensation resistor, the compensation resistor being associated with a compensation resistance; the compensation amplifier is configured to receive at least the amplified voltage and coupled to both the compensation transistor and the compensation resistor; the compensation transistor is coupled to at least the compensation resistor and configured to generate the compensation current; and the compensation current is equal to the amplified voltage divided by the compensation resistance in magnitude.