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Optimum power-saving method for power MOSFET width of DC–DC converters

Optimum power-saving method for power MOSFET width of DC–DC converters

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An optimum power metal-oxide-semiconductor field effect transistor (MOSFET) width technique is proposed for enhancing the efficiency characteristics of switching DC–DC converters. By implementing a one-cycle buck DC–DC converter, it is demonstrated that the dynamic power MOSFET width controlling technique has a much improved power reduction whether the load current is light or heavy. The maximum efficiency of the buck converter is ∼92% with a 3% efficiency improvement for the heavy load condition. The efficiency is further improved by ∼16% for the light load condition as a result of the power reduction from the large power MOSFET transistors. Also proposed is a new error-correction loop circuit to enable a better load regulation than that of previous designs. Compared with the adaptive gate driver voltage technique, the optimum power MOSFET width can achieve a significant improvement in power saving. It is also superior to the low-voltage-swing MOSFET gate drive technique for switching DC–DC converters.

References

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      • Santi, E., Cuk, S.: `Modeling of one-cycle controlled switching converters', Proc. Telecommunications Energy Conf., Oct. 1992, p. 131–138.
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