Power factor corrector power sharing

An apparatus comprising:

• a first active power factor corrector for receiving power from a first alternating current (AC) power source, the first active power factor corrector comprising:
• a first rectifier;
• a first boost converter having a first transistor and a first capacitance;
• a second active power factor corrector for receiving power from a second AC power source having at least one line or neutral in common with the first AC power source, the second active power factor corrector comprising:
• a second rectifier;
• a second boost converter having a second transistor and a second capacitance;
• and
• a power sharing manager comprising:
• a buck converter to step down voltages of the first boost converter and the second boost converter, the buck converter having a third transistor;
• diodes to prevent circulation of current between the first active power factor corrector and the second active power factor corrector;
• a fourth transistor, wherein the third transistor and the fourth transistor prevent circulation of current between the first boost converter and the second boost converter via the buck converter;
• a controller controlling the third transistor and the fourth transistor to close the third transistor unless the second transistor is open, unless the fourth transistor is closed or unless a potential between the second AC power source and the first AC power source exceeds an output of the second active power factor corrector and to close the fourth transistor unless the first transistor is open unless the third transistor is closed or unless a potential between the first AC power source and the second AC power source exceeds an output of the first active power factor corrector.

A method comprising:

• receiving, at a first active power factor corrector and a second active power factor corrector, power from a first alternating current (AC) power source and a second AC power source having at least one line or neutral in common with the first AC power source;
• correcting a first power factor of the power via a first boost converter of the first active power factor corrector;
• correcting a second power factor of the power via a second boost converter of the second active power factor corrector;
• providing the power to a power-sharing manager;
• stepping down voltages of the power via a buck converter of the power-sharing manager;
• preventing circulation of current between the first boost converter and the second boost converter utilizing a first transistor and a second transistor of the buck converter;
• preventing circulation of current between the first active power factor corrector and the second active power factor corrector via a plurality of diodes of the buck converter;
• and
• alternately transmitting power to a load from the first active power factor corrector and the second active power factor corrector in parallel.