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The proposed circuit aims to harvest energy from freight railcars, in which a three-phase electromagnetic generator (EMG) is used to harvest kinetic energy. The key idea of the proposed circuit is to extract maximum power from the EMG through impedance matching until the charge level of the battery reaches 90%. Once, the battery reaches the charge level, it switches the operation mode and regulates...
This paper presents a solar energy harvesting (EH) system to power a portable compact LED lamp, which can be charged during daytime and used to light during night time. The solar lamp consists of three PV panels, an EH and power management circuit, three NiMH rechargeable batteries, and an LED. A commercial off-the-shelf chip TI BQ25504 is used to prototype the EH and power management circuit for...
A two-phase buck converter with optimum phase selection for low power applications is presented in this paper. The two-phase converter has a baby-buck phase optimized for light load and a heavy-load phase optimized for heavy load. The phase selector selects an appropriate phase depending on the load current to improve the efficiency. The two phases adopt pulse frequency modulation with constant on-time...
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