Using offset cancellation circuit to mitigate beat-frequency oscillation of phase currents in a multiphase interleaved voltage regulator
AssigneeRickhtek Tecnology Corp.
InventorsChen-Hua Chiu, Ching-Jan Chen, Dan Chen, Wei-Hsu Chang
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Abstract
For a multiphase interleaved voltage regulator, an offset cancellation circuit is applied for each phase separately. The current loop gain of each phase is thus increased to mitigate the beat-frequency oscillation in phase currents when the beat frequency is below the bandwidth of the low-pass filter in the offset cancellation circuit, without introducing additional instability issue that is the drawback of increasing current-sensing gain.
Claims9
A multiphase interleaved voltage regulator for providing a regulated output voltage at an output terminal thereof, the multiphase interleaved voltage regulator comprising:
- an input terminal receiving an input voltage;
- a compensator in a voltage control loop, coupled to the output terminal, operative to provide a compensation signal;
- and
- a plurality of phase circuits coupled to the input terminal, the output terminal and the compensator, operative to generate a plurality of interleaved phase currents, each said phase circuit having an offset cancellation circuit for increasing a current loop gain thereof, so as to mitigate beat-frequency oscillation of the phase currents.
Dependencies are inferred from the claim text.