-This paper presents a control scheme to implement the energy-savings of three-phase induction motors when they operate under long-term light-load or small duty ratio load. The proposed scheme is based on the principle of variable voltage control (VVC) at constant speed. The energy-saving controller for three-phase induction motors is developed. A group of the experiments demonstrate that the proposed scheme gives rise to the considerable energy-savings.
A novel lateral double-diffusion MOS (LDMOS) with n + floating islands in the substrate (NFI LDMOS) is proposed. In the NFI LDMOS, a series of n + floating islands are introduced into the substrate. On the condition of a high-voltage blocking state, n + floating islands induce the high potential from the drain region to the source region, which modulates the drift region's electric field and leads to a higher breakdown voltage (BV). What is more, the specific on-resistance (R on,sp) is reduced by the higher doping concentration of the drift region due to the n + floating islands. Compared with the conventional LDMOS at the same 40 μm drift region, the BV of the NFI LDMOS is enhanced by 74.6% and R on,sp is reduced by 19.7%. So, the proposed NFI LDMOS possesses a higher figure-ofmerit (FOM).
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