Browsing by Author "Chien, C.-C."

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Optimum power-saving method for power MOSFET width of DC-DC converters
(2007-02-01)
Chen, K.-H.
;
Chien, C.-C.
;
Hsu, C.-H.
;
Huang, L.-R.
;
電控工程研究所
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 similar to 92% with a 3% efficiency improvement for the heavy load condition. The efficiency is further improved by similar to 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.