Abstract
As modern microprocessors continuously advance, the multiphase voltage regulator design becomes more and more challenging. Compared with non-coupled inductors used in voltage regulators, an indirect-coupled inductor helps improve the circuit transient response dramatically. However, a design conflict exists for the traditional indirect-coupled inductor, since further improving the circuit transient response will increase the inductor current ripple and lower the circuit efficiency. To solve this issue, this paper proposes a novel indirect-coupled inductor with an adaptive coupling coefficient. By utilizing the current information in the indirect-coupled inductor and applying a nonlinear inductor, the proposed coupled inductor structure helps voltage regulators achieve a smaller output voltage spike during load transients while maintaining a small inductor current ripple, as compared with the traditional indirect-coupled inductor structure. The proposed inductor structure can be easily implemented without increasing the control complexity and cost. Finally, experimental results prove that the proposed coupled inductor structure helps reduce the output voltage spike by 18 % as compared with the traditional indirect-coupled inductor structure based on a four-phase buck converter platform.
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