Method and system for current sharing among a plurality of power modules

A power system comprising:

• a current share bus;
• and
• a plurality of power modules each having respective output terminals coupled together to provide a common output, each one of the plurality of power modules including:
• a power regulator providing an output signal on a corresponding output terminal;
• a bus interface adapted to communicate with said current share bus;
• and
• a feedback loop adapted to sense said current level of said output signal and provide a feedback signal to said power regulator in response thereto, said feedback signal thereby controlling said power regulator to regulate said output signal, said feedback loop comprising a converter adapted to provide a first signal having a pulse width corresponding to said sensed current level, said feedback loop further comprising an error controller adapted to detect a phase difference between said first signal and a second signal received from said bus interface from said current share bus;
• wherein, said feedback loop imparts said first signal onto said current share bus if said first signal has a pulse width greater than corresponding first signals of other power modules communicating with said current share bus, whereupon said first signal becomes said second signal.

A method of sharing current among a plurality of power modules, comprising:

• sensing a characteristic of an output signal of at least one of said plurality of power modules;
• providing a first signal having a pulse width corresponding to said sensed characteristic;
• imparting said first signal onto a current share bus coupled to each of said plurality of power modules if said first signal has a pulse width greater than corresponding first signals of other power modules coupled to said current share bus, whereupon one of said first signals from said plurality of power modules having greatest pulse width is imparted onto said current share bus as a second signal;
• detecting a phase difference between said first signal and said second signal;
• and
• providing a feedback signal to said at least one power module in response to said detected phase difference, said feedback signal thereby controlling said at least one power module to achieve current sharing among said plurality of power modules.