Patent ID: 8856557

Claim:
An apparatus to perform power balancing of power supplies, the apparatus comprising: a power module that measures an amount of input power for each of a plurality of switching power supplies, each switching power supply comprising a rectifier and at least one switching regulator stage, each switching power supply including an input line wherein the input line connects to an input side of the rectifier and an output side of the rectifier connects to the at least one switching regulator stage, the power module measuring an amount of input power for a switching power supply by measuring a current and a voltage on an input line to that switching power supply; a conversion module that converts the measured amount of input power of each switching power supply to a digital power measurement signal; an averaging module that determines an average amount of input power per switching power supply of the plurality of power supplies based on a summation of the digital power measurement signal of each switching power supply; a comparison module that compares the digital power measurement signal of a switching power supply of the plurality of switching power supplies to the determined average amount of input power per switching power supply of the plurality of switching power supplies; and an input power adjustment module that adjusts the input power of the switching power supply to cause the amount of input power of the switching power supply to be substantially equal to the determined average amount of input power per switching power supply, wherein for each switching power supply, the input power adjustment module adjusts the input power of the switching power supply by adjusting a voltage reference signal of the switching power supply, wherein the switching power supply adjusts an output voltage of the switching power supply based on the voltage reference signal.