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With more and more functions in modern battery-powered mobile devices, enabling light-harvesting in the power management system can extend battery usage time [1]. For both indoor and outdoor operations of mobile devices, the output power range of the solar panel with the size of a touchscreen can vary from 100s of µW to a Watt due to the irradiance-level variation. An energy harvester is thus essential...
This paper presents an integrated photovoltaic energy harvester that is capable of performing global maximum power point tracking (GMPPT) with significant reductions in MPPT transient time, power dissipation and silicon area. A fast-transient global search algorithm is proposed to identify the GMPP of a solar panel within hundreds of $\mu \text {s}$ in the presence of multiple local maxima during...
Standalone systems such as outdoor lighting and remote monitoring stations can be self-powered by solar panels (SPs) having output powers of tens of watts. When the size of the SP is large, part of it can be shaded by birds, trees and other objects resulting in partial shading conditions (PSCs). Multiple local maxima in the power-versus-voltage (P-V) curve of the SP are generated during PSCs [1]....
Current accuracy of an LED is vital to its brightness control. Existing hysteretic current control method provides accurate average current, but requires high power dissipation. Peak current control (PCC) method mitigates the power issue, but does not supply accurate average current. A quasi-hysteretic control with adaptive off-time technique is thus proposed in this paper to solve both problems,...
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