Method and system for communicating filter compensation coefficients for a digital power control system

A power control system comprising:

• a plurality of point-of-load (POL) regulators each comprising at least one power switch adapted to convey power to a load and a digital controller adapted to control operation of said at least one power switch responsive to a feedback measurement, said digital controller further comprising a digital filter having a transfer function defined by plural filter coefficients;
• a serial data bus operatively connecting said plurality of POL regulators;
• and
• a system controller connected to said serial data bus and adapted to communicate digital data to said plurality of POL regulators via said serial data bus, said digital data including programming data for programming said plural filter coefficients;
• wherein said digital controller further comprises:
• an analog-to-digital converter providing a digital error signal representing a difference between said feedback measurement and a reference value, said digital filter providing a digital control output based on a sum of current and previous error signals and previous control outputs;
• an error controller adapted to modify operation of said digital filter upon an error condition;
• and
• a digital pulse width modulator providing a control signal to said at least one power switch, said control signal having a pulse width corresponding to said digital control output.

A method of controlling a plurality of point-of-load (POL) regulators each comprising at least one power switch adapted to convey power to a load and a digital controller adapted to control operation of said at least one power switch responsive to a feedback measurement, said digital controller further comprising a digital filter having a transfer function defined by plural filter coefficients, the method comprising:

• receiving programming data for programming said plural filter coefficients;
• transmitting said programming data serially over a common data bus operably connected to said plurality of POL regulators;
• and
• programming said plural filter coefficients of respective ones of said POL regulators in accordance with said programming data.

A method for programming a power control system including a plurality of point-of-load (POL) regulators each comprising at least one power switch adapted to convey power to a load and a digital controller adapted to control operation of said at least one power switch responsive to a feedback measurement, said digital controller further comprising a digital filter having a transfer function defined by plural filter coefficients, the method comprising:

• displaying at least one screen simulating operation of an exemplary point-of-load regulator, said at least one screen including user selectable values for characteristics of at least one of said plurality of point-of-load regulators;
• receiving user input to select said user selectable values;
• calculating digital filter coefficients corresponding to said user input;
• and
• selectively communicating data corresponding to said calculated filter coefficients to said at least one of said plurality of point-of-load regulators for programming said digital filter.