Sub C Batteries

Effective Energy-Harvesting Requires Appropriate Components

(Power Electronics Technology Via Acquire Media NewsEdge) Efficient harvesting has been hampered by the many different power management blocks and associated functions. As essential components were assembled, more space was consumed, which defeated the goal of reducing application size and cost. Meanwhile, a larger battery cell was needed for storage because quiescent current was added to the system, and the overall power budget rose to unmanageable levels for low-energy ambient sources. One component that integrates all the necessary power management functions is Maxim’s recently introduced MAX17710 (Fig. 1). Operating at an ultra-low current level, the MAX17710 accepts energy from a variety of poorly regulated energy harvesting sources with output levels ranging from 1µW to 100mW. Examples include light from photovoltaic cells, vibration from piezoelectric elements, heat from a thermoelectric generator, and RF from near-field communications (NFC).
These batteries add bulk to the form factor and can be unwieldy to use in high-volume deployments. Eventually each battery needs to be replaced, a process that costs both time and money. A new component that solves the battery size and replacement issue is the THINERGY® Micro-energy Cell (MEC) from Infinite Power Solutions Inc. (IPS) a solid-state, rechargeable, thin-film battery, shown in Fig. 2. The MECs exhibit high cycle life capabilities and unique metal foil encapsulation enables decades of reliable, maintenance-free operation. The MAX17710 integrates a programmable input boost regulator and needs no expensive external components to charge an MEC with energy sources as low as 0.8V. It protects the MEC by using a linear shunt-series regulator. An ultra-low-quiescent current, adjustable low-dropout linear regulator (LDO) with selectable voltages of 3.3V, 2.3V, or 1.8V allows the MAX17710 to adapt to a variety of loads. Packaged in a low-profile 0.5mm TQFN, it enables a new class of thin, card-like applications. The IC will also be available in wafer form to enable even thinner form factors. The MAX17710 is targeted for powered smart cards, real-time clock (RTC)/memory backup applications, and wireless sensor networks.

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Proceedings of the Symposium on Batteries for Portable Applications and Electrical Vehicles

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PC magazine, the independent guide to IBM-standard personal computing

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Federal supplement

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Transmitter hunting, radio direction finding simplified

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