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Wireless microsensors can sense and share data that can save lives, energy, and money. Recharging or replacing thousands of tiny, easily exhaustible batteries, however, is too costly. Fortunately, photovoltaic (PV) cells can generate 100x more power from sunlight than other transducers can from motion, heat, or radiation. But since PV cells cannot supply the milliwatts that microsystems can at times...
Wireless microsensors in factories, hospitals, cars, and so on process information that can save money, energy, and lives. Unfortunately, tiny batteries exhaust quickly, and replacing so many of them frequently is impractical. This is why recharging them with ambient energy is so appealing, especially when vibrations, for example, are abundant and steady. Still, tiny piezoelectric transducers draw...
This paper presents the second Electric Power Supply (EPS) prototype designed for supplying power to the Space Plasma Ionic Charge Analyzer (SPICA) CubeSat. In order to power the CubeSat with higher efficiency, Gallium Arsenide (GaAs) solar panels are mounted on each side of the cube, converting solar power into electrical energy. Solar cell area limitations require maximizing the available electrical...
Battery-supplied systems demand fast, power efficient, and compact power supplies. Although linear regulators are quick and small, tiny batteries cannot sustain their losses for long. Pulse-width-modulated (PWM) switchers are considerably more efficient, but also slower. Luckily, hysteretic converters can respond within one switching cycle. Stabilizing the system for maximum speed with a hysteretic...
Portable microsystems, which typically incorporate transceivers, analog/digital converters, microprocessors, and others, require several fast on-chip supplies to both function and save energy. Linear regulators are fast and compact, but also lossy, and although switched inductors are efficient, power inductors are bulky, which is why supplying several functions with one inductor is often an optimal...
Because wireless microsystems can only incorporate tiny batteries, they typically exhaust stored on-board energy quickly. Fortunately, harvesting ambient energy is a viable means of extending their operational lifetimes, except starting and re-starting miniaturized microwatt harvesters from nocharge conditions is difficult. The challenge is drawing usable energy from millivolt signals under micro-scale...
A challenge wireless microsensors and other microsystems face is short lifetime, because tiny batteries store little energy. Fortunately, the environment holds vast amounts of energy, and of available sources, like light, motion, temperature, and radiation, solar light produces the highest power density. Still, micro-scale photovoltaic (PV) cells harness a diminutive fraction of light and artificial...
Battery-powered electronics rely on integration and power efficiency for size and operational life. Switched-inductor converters play a critical role in this because most portable systems depend on dc-dc converters to supply power efficiently. Understanding the collective impact of shrinking dimensions on total power losses in a switching converter is therefore important when selecting a process technology...
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