Patent ID: 7230407

Claim:
A fixed-frequency switching power supply comprising: N switches coupled to a D-C power source and configured to receive an input energy therefrom, wherein N is a positive integer, and wherein said N switches are configured to divide said input energy into N phases; N inductances, wherein each of said N inductances is coupled to one of said N switches; a capacitance coupled to each of said N inductances and coupled to a dynamic load, wherein said capacitance and said N inductances are together configured to provide an output energy to said dynamic load; a monitor circuit coupled to said capacitance and configured to monitor said output energy; and a control circuit coupled to said monitor circuit, configured to derive a first state variable of said power supply from said monitor circuit, to synthesize a second state variable of said power supply from said first state variable, and to switch said N switches at a substantially constant switching frequency in response to said first and second state variables.