Patent ID: 7538527

Claim:
A power converter comprising: a first stage comprising a current source for generating a current signal; and a second stage comprising: n output circuits coupled to the current source for converting the current signal into n corresponding output voltages, wherein each of the n output circuits comprises an output switch responsive to a corresponding n th control signal for regulating the corresponding n th output voltage; and a controller for generating the n control signals comprising: for each of the n output circuits: an error amplifier configured to generate an output signal based upon a comparison of the output voltage of the n th output circuit and a corresponding n th reference voltage; a waveform generator for generating a waveform signal, wherein the waveform signals for the n output circuits are characterized by a common amplitude and period, and wherein the phases of the waveforms signals are spaced at predetermined intervals; and a summing circuit for summing the output of the error amplifier and the waveform signal to generate an amplitude-shifted waveform signal; and a comparator circuit for outputting the n control signals to the output switches based upon a comparison of the relative amplitudes of the amplitude-shifted waveform signals.