Patent ID: 8072094

Claim:
An active output compensation circuit for a power supply which is connected to a power source to receive input power and regulate to become a plurality of different output power and also includes a transformer to receive the input power and generate inductive power, a switch circuit to regulate the period of the inductive power and a plurality of output regulation units electrically connected to the transformer to regulate the inductive power to the output power, comprising: a voltage difference judgment unit which is electrically connected to the output regulation units and has at least one comparison circuit to compare voltage difference of the output power of two output regulation units to determine whether to output an ON signal; and a compensation channel switch electrically bridging the two output regulation units and the voltage difference judgment unit, wherein the compensation channel switch electrically connects to the output power of two output regulation units, and the compensation channel switch is driven by the ON signal and set ON to allow one output power to compensate another output power; where the output power have different potentials, and the comparison circuit has a positive input end and a negative input end to receive different output power and an output end to output the ON signal; wherein the positive input end of the comparison circuit and the output end are bridged in parallel by a hysteresis unit.