Simultaneously supplying positive and negative voltages based on a single inductor

Abstract

Simultaneously supplying positive and negative voltages based on a single inductor is disclosed. Herein, the single inductor is coupled between a positive voltage rail that supplies a positive voltage and a negative voltage rail that supplies a negative voltage. The single inductor is first magnetized to store energy in a magnetic field. Subsequently, depending on whether the positive voltage or the negative voltage is at a deficit, the single inductor is demagnetized to provide a charge current exclusively to the positive voltage rail or the negative voltage rail. Thereafter, the single inductor will continue to demagnetize to provide the charge current to both the positive voltage rail and the negative voltage rail. By exclusively providing the charge current to either the positive voltage rail or the negative voltage rail, it is possible to accommodate a larger load current variation to thereby improve robustness of the overall operating conditions.

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