Current--voltage measurements obtained from lead zirconate titanate/nickel bilayered hollow cylindrical magnetoelectric composite showed that a sinusoidal current applied to the copper coil wrapped around the hollow c...Current--voltage measurements obtained from lead zirconate titanate/nickel bilayered hollow cylindrical magnetoelectric composite showed that a sinusoidal current applied to the copper coil wrapped around the hollow cylinder circumference induces voltage across the lead zirconate titanate layer thickness. The current--voltage coefficient and the maximum induced voltage in lead zirconate titanate at 1~kHz and resonance （60.1~kHz） frequencies increased linearly with the number of the coil turns and the applied current. The resonance frequency corresponds to the electromechanical resonance frequency. The current--voltage coefficient can be significantly improved by optimizing the magnetoelectric structure geometry and/or increasing the number of coil turns. Hollow cylindrical lead zirconate titanate/nickel structures can be potentially used as current sensors.展开更多
Resonant converter(RC)was brought under research in the 80’s widely,which can attain very small switching loss,therefore,facilitating resonant topologies to function at the high switching frequency.It is well address...Resonant converter(RC)was brought under research in the 80’s widely,which can attain very small switching loss,therefore,facilitating resonant topologies to function at the high switching frequency.It is well addressed in the review that the optimal parameterization of the resonant converter is a crucial task.While the literature has come out with different methodologies,they are highly conceptual and so the uncertainty due to high theoretical impact persists.This paper intends to develop a Parameter Optimization(PO)algorithm for designing and developing of LLC-RC.The proposed algorithm overwhelms the limitation by introducing a nonconceptual model based on the simulated outcome.Specifically,the resonant current under start-up conditions is acquired from the literary outcome,and the intelligent model is constructed.Based on the proposed model,a renowned search algorithm called as Whale Optimization Algorithm(WOA)is exploited to optimize the time constant of the resonant converter,which is a critical design parameter.The objective model is derived as a function of start-up time and so the start-up time can be minimized.Moreover,the response speed of the output voltage is also increased.The proposed Whale Optimization Algorithm based Parameter Optimization(WOAPO)is compared with the conventional techniques such as IAPO,Ant Bee Colony-PO(ABC-PO),Particle Swarm Optimization-PO(PSOPO),FireFly PO(FFPO)and Grey Wolf Optimization(GWOPO).The obtained result verifies the performance of the proposed method in modeling LLC-RC system.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 50572006, 50802008 and 50874010)the Natural Science Foundation of Beijing, China (Grant No. 2073026)+2 种基金the Program for New Century Excellent Talents in University(Grant No. 20060420152)Scholars and Innovative Research Team in University (Grant No. 0509)Alex A. Volinsky wouldlike to acknowledge support from NSF (Grant No. CMMI-0600266)
文摘Current--voltage measurements obtained from lead zirconate titanate/nickel bilayered hollow cylindrical magnetoelectric composite showed that a sinusoidal current applied to the copper coil wrapped around the hollow cylinder circumference induces voltage across the lead zirconate titanate layer thickness. The current--voltage coefficient and the maximum induced voltage in lead zirconate titanate at 1~kHz and resonance （60.1~kHz） frequencies increased linearly with the number of the coil turns and the applied current. The resonance frequency corresponds to the electromechanical resonance frequency. The current--voltage coefficient can be significantly improved by optimizing the magnetoelectric structure geometry and/or increasing the number of coil turns. Hollow cylindrical lead zirconate titanate/nickel structures can be potentially used as current sensors.
文摘Resonant converter(RC)was brought under research in the 80’s widely,which can attain very small switching loss,therefore,facilitating resonant topologies to function at the high switching frequency.It is well addressed in the review that the optimal parameterization of the resonant converter is a crucial task.While the literature has come out with different methodologies,they are highly conceptual and so the uncertainty due to high theoretical impact persists.This paper intends to develop a Parameter Optimization(PO)algorithm for designing and developing of LLC-RC.The proposed algorithm overwhelms the limitation by introducing a nonconceptual model based on the simulated outcome.Specifically,the resonant current under start-up conditions is acquired from the literary outcome,and the intelligent model is constructed.Based on the proposed model,a renowned search algorithm called as Whale Optimization Algorithm(WOA)is exploited to optimize the time constant of the resonant converter,which is a critical design parameter.The objective model is derived as a function of start-up time and so the start-up time can be minimized.Moreover,the response speed of the output voltage is also increased.The proposed Whale Optimization Algorithm based Parameter Optimization(WOAPO)is compared with the conventional techniques such as IAPO,Ant Bee Colony-PO(ABC-PO),Particle Swarm Optimization-PO(PSOPO),FireFly PO(FFPO)and Grey Wolf Optimization(GWOPO).The obtained result verifies the performance of the proposed method in modeling LLC-RC system.
